Hi all, I have the default video card (Radeon HD 2600, 256mb), and am thinking of upgrading to a 512 meg video card for the Photoshop stuff I'm doing now, and some light video editing I'll be doing later on. I'd also like to be ready to take advantage of more video memory for when CS5 64 bit comes out. Is there a (somewhat) inexpensive option for a 512 meg video card for the early 2008 Mac Pro? I'd like to spend ~$200 at the most, less if at all possible. This card is NOT for gaming - the only games I play are through MAME, and the current card can handle those just fine. I read something about the NVIDIA GeForce GT 120 being able to work on my machine...is it significantly better than the HD2600? Thanks for any info!