Most oval racing is done with a 1s LiPo pack these days. 2 cell is occasionally run outdoors on pavement in 1/10 scale, but primarily all 1/10 and 1/12 is 1s LiPo.

Reedy Wolfpacks, Fantoms, and Trinity Revtech packs are popular where I race.
http://www.stormerhobbies.com/cgi-bi...ns&pn=FAN26203


You'll also need a Lipo capable charger... something like this...
http://www.teamassociated.com/lrp/pa...ails/LRP41281/


Also, sidenote, most oval racers hang out on hobby talk.... you might have better luck for on-going advice there. http://www.hobbytalk.com/bbs1/forumdisplay.php?f=20

For offroad, and on-road/road-course RCtech is the best!