You basically have 4wd and 2wd as your choices currently.
With the new F201 from Tamiya, all the momentum is toward the 4wd chassis right now. Kyosho also makes an electric F-Ten which is not available in the US (but you can order it from Japan,) and it's more like 1/9 scale since it's a Superten class car. There are many companies jumping on the F201 hopup bandwagon, so the possibilities are pretty much unlimited for the F201. It drives like a sedan, so the learning curve is not very steep.
In the 2wd "pan car" class, you have the F103 from Tamiya, the Fireforce CF-01 from Cross and the Corally F1 cars with reasonable support. If you look on Ebay, you can find many other cars that make use of Associated and/or Tamiya parts. These three cars are reasonably well supported through current US distribution, so your lhs should be able to get you one of these cars and support it with ease. If you're forced to go online or prefer to, Tower carries Tamiya ( www.towerhobbies.com
) and Ehobbies has some parts ( www.ehobbies.com
,) but my recommendation would be to go with MDI Racing in Florida. ( www.mdiracing.com
) They are very accomodating and will go look for difficult to find parts that most hobby shops won't bother with. If you're looking for F201 parts, try Castle Hobbies in San Jose, CA ( www.castlehobbies.com
) and Formula1 RC in Hawaii ( www.formula1-rc.com
) Formula1 RC is a great source of information and has a message board dedicated to Formula1 RC cars. Good luck and I hope you get on the track soon to race these very fun cars!