A sensored setup with boost will be much more fun to drive. The throttle response will be smooth, and you will feel when the car shifts into turbo.
http://www.rcmart.com/hacktronic-com...Path=1560_1301
Any 2.4 ghz will be sufficient. No point in buying a $500 radio, if you are just doing this for fun. For $16, you can't go wrong with this one.
http://www.rcmart.com/onisiki-24ghz-...ml?cPath=36_47
Same goes with servo. No point getting a $120 servo, unless you plan on racing with the best.
http://www.rcmart.com/power-high-spe...Path=1099_1025
Hope this helps. Have fun!