I also run a pally + priest combo, though in my case it's 1 pally, 2 priests. The pally is spec'd Ret, and the priests are a Holy/Disc Smite based build, and they're quickly pulling up on 50 now. Yeah, laugh now - lolret & lolsmite, two of the most ridiculed builds out there. But they perform well together, and Sancticty Aura seems like it was made for just such a group. The basic stragegy when 'soloing' is that the paladin will act as a tank/melee dps hybrid, holding aggro while the priests burn or, as nessesary, heal in a caster DPS/support healing role. In a larger group, I can tank myself with the paladin, or use focus to designate someone else as the tank. If I'm also being asked to main heal, I'll do so by using both priests in a dps/healing hybrid role. (Good in that I'm doubling up heals, and hence healing twice as fast in dire straights as a single healer, and in that I can dish out extra damage on light healing fights, but bad in that I tend to burn myself out of mana too quickly on endurance fights)


You can conserve a lot of your actionbar real estate by combining skills according to function. As an example, parts of my setup:

Righteous Defense + Fade bound to the same key - this functions as a 'get aggro back on the paladin' key.

Consecrate + Holy Nova - works as both a 'focus aggro from any extraneous mobs/repawns/pats/etc. onto the paladin' key, and as an emergency spammable AoE burn, while at the same time doing minor 'topping off' level healing to all three. ( VERY mana intesive to spam, though)

Smite + a Judge & reseal castsequence macro - this is my standard DPS spam macro. I use this on two buttons, one which retargets the priests onto the paladin's target, and one which keeps them spamming at their current target until it falls over, then has them follow the paladin's lead.

Bubble + Bubble - set so that the priests both try to bubble, in order of preference; the paladin's target if that target is friendly, thier preset focus, the paladin, or barring all that (everyone of those choices is an enemy or dead), themselves. The paladin will also bubble, if she's got an allied target selected that isn't herself or her focus. ( I use the focus function to designate a tank in 5man situations where my paladin will be DPSing instead of tanking )

Cleanse + Dispell Magic + Abolish Diesease - you get the picture



As for healing, you'll never have enough keys to prepare for every possible configuration of healers, spells, and targets, so the key is to condense all those heals into a handful of keys that will easily do your most nessesary/ most commonly used heals, but can also be manipulated into casting less used combinations. One good way to do this would be to set a key to heal each of your characters (say, F1 = Pally, F2= Priest ) with a simple, quick heal, and using Alt/Shift/Control modifiers to select various larger heals as nessesary. Or, go the other way and bind a few keys to specify heals ( say, 5=Flash Heal/Flash of Light, 6= Holy Light/Greater Heal, 7= PW Shield, etc), using the unmodifed form to heal one toon, and a modifier ( Alt/Shift/Cntrl) to heal the other.

I have all my healing condesed to 5 keys:
The first has both priests cast renew on a series of target options much like the above bubble macro: first choice is my paladin's target, in case I need to specifically heal one person, second is a predesingated focus, for situtations where someone else is tanking, third and default is my paladin, since that's where most of the incoming damage will go when I'm 'soloing'. If I need to heal one the priests with this, I simply target them with the paladin lead and press away.

The second healing key has the same preferance order in targeting, but has one priest use Flash Heal, the other use Greater Heal. The idea here is to get both a quick emergency heal and a slower powerful heal out at once. The Flash heal helps to insure the target survives long enough for the Greater, and the Greater provides catch-up power that doubled Flashes wouldn't.
These two cover most all of my healing needs .... if I need to heal someone, I target them on my paladin and press the button. If I'm not targetting anyone, It'll heal the tank (set using focus), and if I haven't set the focus (not in a group), the heals will default to the paladin.

The other three healing buttons are an earlier remant version, each button is set to heal one of my characters by having both priests cast renew (or Alt- Flash heal), these are now relegated to a mostly unused portion of my keyboard. I still occasionally use them to pass a quick double renew to one of the priests without needing to target them on my main, but I could easily do without ever using these 3 buttons again. ( in PvE, at least, PvP they're kinda handy )

Now, I know that I'll probabaly need to rework that healing setup some once I get into the BC healing spells (Prayer of Mending, Binding Heal, maybe Circle of Healing), but I'll cross that bridge once I get there.

As for buffs, I have 3 keys set up for that. The first has each toon cast self-buffs ( Righteous Fury & Holy Fire ). The second and third keys have all 3 toons buff my main's target, one priest with Fort, the other with Divine spirit, and the pally with Blessing of Wisdom/Might depending on the key. I like this setup because I can target someone running by, hit one key, and BOOM! lay every buff I have onto them.

All of my priests other dps spells (SW Pain, Mind Blast, Holy Fire) are set on a macro with Alt/Shift/Cntrl modifiers to select. I don't use these all that much, I'm a Smite junkie, what can I say?

All the other stuff has no comparable function on the alternate class, so are bound to keys that are blank on the other clients. It means some panic-button skills aren't as conveniently placed as I'd like, but that's a part of the price you play for controlling 2 classes at once