My Dad is a huge NASCAR fan! Personally I like to watch races that are more than just "Go fast, Turn Left"! Now I'm not saying there is anything wrong with NASCAR. But the cars are all a little too cookie-cutter like for my taste and don't even come close to their stock counterparts.
I used to watch the BTCC on speed a few years ago. Man those guys work their respective butts off racing. Those are REAL headlights and they race rain of shine!
Alas, I no longer have the Speed Chanel so I'm stuck with following the sport on the internet.