If you're looking for a kit, the Super Sport (SS) versions of HPI's touring cars are good. And I think they come with engine and radio (correct me if I'm wrong) so you don't have to buy them yourself. I also think that associated and kyosho have kits out, but those require you to buy your own engine and radio.
Yes, though, offroad RC has a bigger fanbase. Almost all the people I can think of that I know that have RC's have offroad ones. If you're looking for a kit then most RC manufacturers offer kit versions of their most popular vehicles. The exception to the rule is Traxxas, who always has their cars "ready-to-race".