IMO you should go for the z-car and a 3.8 motor from Tiny.. Your car would rip!! the factory 2.2 in the z-car is still pretty nice! But in the 3.8 from tiny your car is going to be FAST!
I would suggest buying the z-car and then getting these options from here.
http://tinyrc.com/shop/products.php?...227633154d6526
and get the 3.8 and the microsizers tune up kit. Then you should be flying!