Okay I know this is off topic but would you all suggest getting the ATI card? It's an extra 250. I mainly use my Powr Mac...and my soon to be new Mac Pro for video (dvd editing and sales). What does one need rotation for? Video games?
If you do Video editing, you may find the ATI card benificial when you use Motion (that is assuming you use Final Cut Studio) or if you use Shake or After Effects (as far as I am aware these two programs are GPU dependant - correct me if I am wrong ).