3 Manning Heroics, what can be done?

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First I would just like to say hello to everybody! I have been lurking on these forums for well over a year now and finally tried out multiboxing today with 3 trial accounts. I'm officially hooked. Though I won't be able to actually start till next summer, so that kind of sucks. After getting a taste I don't know if I will be able to wait that long without biting the bullet. But anyway, on to my questions.

I have read multiple posts on these forums about people successfully triple boxing heroics. I was wondering exactly what heroics are tri-boxable? What would be the gear required to even attempt heroics with only 3 characters? What would be the best group composition for this kind of goal?

Ok, so I don't have ANY experience with ANY of the Wotlk 5 man heroics, so I have no clue what is require (apart from what I have read here) to even begin to attempt them. From my understandings, if your tank is decently geared (ie. 535-540 defense+ and decent avoidance) you would be fine if the rest of your group was just in even the most basic of level equivalent gear. Now I would guess, that with only 3 characters, you would want not only your tank to be decently geared but also your other 2 characters. What are your views on this? For any of you who have actually attempted this sort of thing, what was your gear when you first started heroics? I assume you could also get by with only having your tank and healer decently geared, but again I have no experience with any of these encounters so I wouldn't know what to expect.

For those of you who have successfully tri-boxed heroics, what heroics have you cleared? For everybody, what heroics do think are conceivably tri-boxable?

For the composition of the group I was thinking of using some of the following dps/healer combinations to go along with a pally tank. I already have a 77 prot pally so that is my reason for using pally tank.

shamy dps/shamy heals
Single class, lots of totems meaning a fair amount of buffs, seems like a decent group. Earth shield is nice for damage mitigation. Shamys seem to be the multiboxers choice pick and they seem very powerful for dps. Not much personal experience with them though.

moonkin dps/tree heals
Single class, some decent buffs, also seems like a fair group. Personally I love tree healers. I have never played 1 but I have grouped with many and the multitude of abilities they posses is very nice. Not too sure on the ups and downs of a moonkin, not much experience with them.

hunter dps/tree heals
I have read many good things about this trinity, mainly pally+hunter because of similar cd's and spell rotations. The hunters pet would be nice to have if I ever needed an off-tank. Hunters are also tons of fun to play, love this class. This group seems though to be lacking in buffs. Same reason for tree as above.

shamy dps/tree heals
This is currently the group I am leaning toward, though I also am really favoring the hunter/tree combo. I have read some good things about shamy/pally/tree trinity and they seem to fit well together. Totems provide for some nice buffs, and same reason for tree as above.

Any other combination suggestions would be greatly appreciated. Would love to read what everybody thinks on this subject.

I have contemplated just going straight to 5boxing instead of 3boxing but I still have plenty of time before I make the final leap. I also figure I will just start out with 3 and see where that takes me, if I really want to go to 5, I'll decide what to do then. (4x wow + bc + wotlk is also a little expensive ^^" lol)

I think that basically sums up all of my current questions. I'm sure I'll have more though later on. (: Looking forward to getting to know everybody on this fantastic forum!

Thanks in advance for any help everybody!

EDIT - Oh and I hope this is in the right section, I couldn't decide between group composition and PvE Instances and Advanced Tactics because my questions are composed of both of them, kind of. lol ^_^