2009 Macbook vs 2011 13in MBP for video djing

[Howcome]

First off, I know this would be a good upgrade CPU wise. My question is about the GPU and what I am using it for. I DJ video using Scratch Live and Mix Emergency. My 2009 Macbook with the Nvidia 9400 runs this system fine, without using the more advanced transitions and effects. I would like to start using the more advanced features. Would the new 13in MBP be a good upgrade GPU wise? I like the 13in for portability and the 15in is out of my current budget. So it is going to be a 13in. I just want to know if the upgrade is worth it or to wait a while and scrape together funds for the 15in. Any help would be appreciated, thanks.