I'm glad you are also a happy owner of a 250 gts!
Haha, I'm sure it could max out a LOT more than just HL:E2
Even at 1080p, I can max all my games except for crysis and the drawdistance on gtaIV. Granted, mine is the 1gig 250, but you also have fewer pixels to render, which should make a pretty big difference.