Anyone looking for a decent race sim, have a look at Simmarket, which has several download versions of Simbin sims on sale at the moment!
GTR Evolution ($12.50): http://secure.simmarket.com/gtr-evolution.phtml
Race On! ($12.50): http://secure.simmarket.com/race-on.phtml
STCC the game ($4.15): http://secure.simmarket.com/stcc-the-game.phtml
And the orginal race07 (Which is bundled with any of the sims above!) ($4.15): http://secure.simmarket.com/race07.phtml
Older games but still worth the purchase!