I'm with Sammy... AWD is for sissies (who can't control a 2WD car). I would add that anything larger than 1/12th is for sissies also. Heh heh
I used to race 1/12th electric... had a lot of fun. Most fun were enduros where he had 2 or 3 man teams and we ran for 2-4 hours, pitting for battery changes.
Go here and look at any of the IFMAR 1/12th scale world championship race videos if you want to see lightning in a bottle:
http://www.teamorion.com/Media