Sweet. I like the direction you are going in. The excel rims are a bit cheaper than the sun rims if you want to save some cash. You can go up to a 140 on the rear with the stock arm if you lace a 18x3.5". I would recommend heading over to KZrider for some more info. there is a whole thread on bracing the frame.
http://kzrider.com/forum/5-chassis/294594-frame-bracing
http://kzrider.com/forum/5-chassis/294594-frame-bracing