I put this servo in my Geneisis LE and while it still can't move the wheels too well while sitting still is has more snap while moving.

http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXLSX0

I took the stock 144oz servo and put it in my RC10GT and if you hold the car up by the front wheels and turn your steering it will move the car!!
Dogman is right though with his advise. The 333 was a little too rich for my wallet though. The 200oz'er was bad enough and I got it on sale at $99.00.