I would probably go with the more race oriented RTR if I had to do one. the T4 or the XXX-T RTR are good choices with the XXX-T costing more because it has better electronics. You can however find deals on it on ebay as the older style but still good XXX-T RTR is going for around $200 or less NIB.
I would recommend a kit so you know how to put it together and take it apart. To me its just more satisfying .
There are cheaper prices out there, if you don't have a LHS or they have crazy markup, check out www.ultimatehobbies.com
they have some good prices, just make sure to call if you don't see anything you want on the site as they have ALOT of stuff not listed on the site for great prices.
If you want some power but still control it, try a 19 turn motor like the Reedy Quad Mag or Orion element. These will be significantly faster than the cheap RTR motors you get but they also don't overpower most ESCs.