Well done, I used to have a slash 2WD
Brushless combo (EZRUN) is good and cheap, under $150.
Lithium Polymer batteries (LIPO) are were the speed is, long runtimes too.
Go to "toadztoyz.com" and have a look there.. heaps of slash parts made by brands such as traxxas, STRC & integy.
PM me if you need a hand with the slash