HPI Sprint 2 : Awesome Belt Drive Drifter
HPI E10 : HPI's Version of the TT-01 with the Unique ability to be able to reconfigure the chassis for Drift or Race.. Unreliable..
HPI Micro : too small to really Enjoy.

Make sure you can get Belts for the Sprint 2 and go with it...

I own both the E10 and the Sprint 2 and prefer the Sprint 2 by far... the E10 just suffers from too many Drive train problems for me to be able to recommend it