RE: What servos do I need
I would wait for the "soon to be released" HS7955TG servos instead -- for two reasons.
The 7955TG has *twice* the resolution of the 5955TG and the 5955TGs will almost certainly under go some heavy discounting when the new model hits the market.
I've got 5955TGs in my 90" 50cc Extra 330L and they work fine -- but I have to admit that the resolution isn't all it could be so I do have a little buyer's remorse now that I hear a better servo will be available for the same money -- but that's the RC game :-)