I used the FD conversion to start, i just upgraded to the td racing motor mount, td racing single speed hub, and td racing collet pinion adapter. IMHO td racing parts are the best by FAR, and there are a lot of people that agree with that statement. Your best bet is to go to lstforums.com to see what some people are using. I use the MMM 2200 KV, 4s 5000mAh lipo. I would buy the battery tray from FD.

Links:

http://lstforums.com

http://tdracingrc.com

http://finedesignrc.com

hope this info helps