I'd start looking for one, but don't swap everything over just yet. It could take a while to rot the seams out - it's not going to be instant, but it will be more of a problem in the future.
As for the electrical stuff... if you are dedicated enough, I'm sure it can be solved, even if it means installing harnesses from a junkyard that haven't been flooded. Shouldn't cost *too* much, especially since it only got to the bottom of the doors and floor pans.
Drivetrain - from what I heard you were flushing everything out repeatedly until the water was gone, and with water only reaching the floor level, I'd only really be afraid of the transfer case and axles. If those are flushed out and don't appear to be corroded inside, you are probably fine.
Basically, I'm saying I wouldn't want anything to do with one that was submerged deeply and not immediately flushed out, nor one that was submerged and then sat on an insurance lot for weeks, went to auction, sat for another few weeks, all the while being eaten from the inside out. If you get right on top of it and clean it out as soon as possible, it should be fine, though it could still have accelerated rust issues down the road. That takes time of course and gives you a while to find a suitable replacement if it starts becoming a problem.