So me and my wife have decide to give Mulit-boxing a try. Done plenty of research on set-ups but have a few questions to see if we will be able to accomplish our goals.

I will be three boxing:
Prot Pally
Resto Druid
Elemental Shaman

Wife will be two boxing:
MM Hunter
Affliction Warlock

Were still in the leveling process now but hope to start running 85 heroics. Since its still early in the leveling process was hoping to get some feedback on the group and its ability to handle Cata Heroics.

Once we get geared up were also hoping to go back and run old raids.

Can 5 85's handle 40 man raid(BWL, AQ40), 25 man raids from BC and 10 mans from Wrath?
Could we do 10 man wrath heroics?

In the future we plan on moving up to a full 10 man raid with each of us 5 boxing.
What classes should we consider adding and does keeping the raid group varied really help that much?

Finally do you think it will be possible to 10 man Cata content. I was thinking that maybe in future patches 4.2, 4.3 that you could possibly out gear some of the 4.0 raids.

Me and my Wife have no raid experience so please be brutally honest. Thanks for any answers, advice our help that you can share.