I will be the one that highly recommends Hydro Thunder Hurricane. It's the best racing game I have played since Diddy Kong Racing for the N64 (nothing can top that game in the racing section). The tracks are very vivid, the game looks and plays great plus there are two achievements that are relativelly easy for the high ratios they have.
That being said it pisses me off that they never discount the DLC for this game. Hydro Thunder was discounted like 3 times very recently but the DLC never sees a price cut.

Same goes with Mercury HG where each of the two DLC costs more than the actual game
