I run cs6, fcp, and a few other programs on it... never crashed once.
The new i5's have a seperate core for graphics load. It rarely effects the performance of the mac overall. The resolutions are the exact same between a card and the onboard. You will notice a difference in 3d rendering and some hd playback if you were using an external display.
For the most part, unless you want a faster dual core i5, a slightly better graphics card, bigger screen/higher resolution, than the 13 is fine.