Need Opions On Dual-Boxing/RAF Running Out!

Ok, so I wanted to find out what 2 toons would be the best/fastest leveling pair? I am going to be using RAF and I'm trying to get 2 toons to 60 ASAP. I tried 2 locks=blah, pally/shaman(shaman healed)=alright, 2 hunters=the best(dps and pets!) and thats basically it. I know most 4 or 5 boxers do shamans which I know are serious damage but for 2 toons might be different. So here I would like to get opions from Veteran Dual/Multi-Boxers. My RAF runs out on the 12th (8days) and I want to do some HARDCORE LEVELING this weekend because then I can gift a toon! :)
Oh and if you want to include how you do your leveling(guides, quests, boosting) that would be cool too. BTW, boosting obviously wouldn't be good for me :) but still a good side note.

THANKS EVERYONE!

i would pick two feral druids.

here's why.

1. self healing through crits.
2. plenty of healing spells.
3. in-combat rez and out of combat rez.
3. tank/healer combo for tough elite quest bosses.
4. travel form works well for level 20-30. until you get your mount.
5. stealth means getting to a quest objective without having to go through an entire field/cave/stronghold full of mobs.
6. as feral, you combat with energy bar, leaving mana bar for emergencies when you need to heal or shift.
7. swim faster and breathe underwater forever.

i've play this class solo and i can tell you its almost nonstop downtime. duo it and you'll probably fly by to 60.

try lock/priest, they have good synergy. i leveled my shadow priest all through outland with a warlock friend, and no one could touch us. at 63, we could easily kill 70's

Feral + Feral is a good combination, but Travel Form is 30th.

Bear 10th.
Cat 20th.
Travel 30th.
Dire Bear 40th.

I leveled pally + priest and it's awesome so far. Just dinged 55 last night (51 when I started playing, and I only played for 2 hrs).
Pally = ret
Priest = disc

You can pull like 6 mobs at once, use Consecration, bubble up, heal when necessary, etc. It may be confusing to set up the macros at first, but after level 20 or so, you kinda get the hang of it. And besides, level 20 is not that hard, it's only like 6 hrs of playing =)

Shaman and mage would be quickest duo to 60 IMO. Mage ports save a TON on run time. And shaman can recall and summon friend which also drastically reduces played time.