which one is the best stampede ?

[speedy]

I,m thinking about buying a stampede but i don't know if i choud get the new or the old one ? i,m gonna convert it into brushless powwer right away so i will not use the stock electronics. is the revo slipper the only drivetrain upgrade on the xl-5 stampede ? wil it fit the old one ? how about the wheel bearings are they bigger on the xl-5 ?