The Tamiya TT-01 is a great option for a spec class. Of course it isn't a "high end" chassis, but that is part of the reason why it is a good choice for a driver's class.
Some of the positives of the TT-01 is that most of the kits come with a brushed speed, a body, and wheels/tires. While not all of the kits come with the same motor, you can choose an inexpensive brushed motor for the class (Such as the Tamiya 540J "silvercan" motor). Another positive is the sealed drive line, which means less maintenance when running outside.
Check out Tamiya's racing website if you want additional information on rules. Here is a link to their spec/novice rules (only TT-01 kits are allowed) http://www.tamiyausa.com/tcs/tcs.php?article-id=541
As was said earlier, you can allow some basic upgrades (such as bearings). One other thing to spec out is an inexpensive battery. The basic speed controls that come with the TT-01 kits will work with a lipo battery. The newer brushed Tamiya speed controls even have a lipo cut-off.