There are lots of options. How much do you want to spend? What kind of voltage will you use and have you already done the upgrades needed to withstand a BL motor?
im not ready to go lipo yet. want to spend around 300 for a setup. i have two sets of 4500, 8.4v batteries ready for now. until i am ready for lipos. i have cvds all around & working on the difs.