You are 100% correct about the SVT-2Pro! I'm really leaning towards the 4Pro anyways...
As far as cabling and power, I don't think it'd be that bad. It seems like it would only involve moving the power cord from the GK to the Ampeg and the output from the wireless to the Ampeg instead of the GK. Unless I'm missing something, which is possible, it's, literally, moving two cords...I think.
The biggest issue I see, is if the stack gets too tall, which on 2x212, which I'm running now, or an 810, could happen, the power cord from the power strip, which would be at the very top of the stack, might not be long enough to reach an outlet on the floor...