Alvin right about there being better cases for the money, but I wouldn't recommend the HAFs over the Xaser VI. Personal taste is the often biggest factor in choosing a case. (And the Xaser VI is all aluminum and offers much more room for expansion than either of the HAFs.) If you like Thermaltake full towers, consider the Spedo and Element V.
And definitely consider a 5750 like Alvin suggested. The 9800GT is rather outdated.