if i were you i would invest in Grand Theft Auto 4 or Just Cause 2. Those are my 2 favorite games ever created. they are both mind blowing! on Just Cause 2 i got it about 2 weeks ago and i have about 30 hours on it, and i probably have about 60 hours on GTA4! they just seem to never get boring. Have fun!
NBA 2k11 is MUCH better than MLB 2k11! i have both a ps3 and a 360 and if you have a ps3 also and you want to play a quality baseball game, i would get mlb 11 the show. I have spent many hours on that game and i am still not bored! it's excellent!