well, after much debating and researching. I think I've decided on this
Phoenix Racer 4840 kit for $800 (might be more after accessories)
And then a battery either from here
or the 51.8v 10ah from here
Both websites claim that it's capable of handling the the 5303 motor. What do you guys think of the batteryspace battery? The website claimed that it could handle up to 2900 watts or something like that or maybe it 2500 watts.