It's a shame, as I've just discovered, that Premiere Pro doesn't make use of multiple GPUs (yet). Having done a quick Google
it does seem to be on a number of folks wishlists but whether Adobe have listened remains to be seen. But that only works if
Adobe include multiple GPU usage in CS6, if
they release CS6 in your required time frame, if
you were going to upgrade anyway and if
you can get more bang for your buck by upgrading your current setup with multiple GPUs. Four ifs
make a mystery (or a female poodle named by someone with a stutter) so I guess you have to go with what is currently available.
So why the GTX570? If I were opting for a dream rig with a single NVIDIA GPU that was both quickest and quietest I'd be thinking Asus Matrix GTX580 Platinum (review
). More expensive, of course, but arguably not prohibitively so. It's faster than the GTX570 (Folding@Home benchmarks elsewhere suggest CUDA enable apps can make use of that speed) and it gets good marks for quietness, a huge virtue in a family environment! A triple slot cooler might be an issue but as you are building a new machine you could design around it. And it glows red
under 100 per cent load. What more could you possibly want?