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compatibility...

According to a TB review, it can get 700 watts at 2 ohms so you can run 2 4ohm cabs with it.

Maybe a 4x10 would work with the 4x12? Something to try out. There are lots of 4x10's out there for a good price.
 
A new head is cool, but whatever you do, don't put 2 bass cabs that far apart. Bass is omni-directional, so you'll fill the room with one cab. If you did use 2 cabs, (identical matched cabs are best), they should stack vertically, in any case.
 
right on... I think I'm gonna try for just upgrading heads

Upgrading's always good. But more watts takes a back seat to greater speaker surface area, greater speaker SPL, greater Xmax, greater air displacement.

You really want louder? Think an additional cab. Identical if possible. Certainly try for the same configuration. Driver specs as close as possible. And yes, stack them.