Ok, lets say that im average skill lvl when it comes to multi boxing.

To make regular non heroic lvl 70 instancing through Outlands, whats the bare minimum?

Right now I have 3 active accounts, 2 of which have a lot of characters 60-70. Third account was a bank account but I just started lvling some of the toons. Will 3 toons make the cut for lvl 70 5 man instances? Should I go 4 or maybe even 5 accounts? I just dont want to waste the time and effort into lvling a third account if theres no point. My goal is to quest and 5 man instance the outlands. Questing alone is easy with 2 accounts, including the group quests.

Thanks for your input.