The GTX 500 series should work out for you. Many on the site (except me unfortunately) are using the geforce cards very successfully.
I apologize for sounded so sarcastic but it's inevitable that anyone trying to run a program like Maya on the native intel HD GPU will at some point have performance issues.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 30-03-2013 at 07:31 PM.