Planning out a new PC build for photography (Lightroom, Photoshop), audio recording and editing (Audition, Sound Forge, Nuendo), and video editing (Premiere Pro, Vegas) in that order of priority. Considering either an nVidia GTX 670, 680, or 690 level card or a Quadro 2000 or 4000 workstation card.
Don't know about sound or video editing, but you should know that LR doesn't use the GPU for image processing. Maybe in a future release. So there's limited gain in ponying up for a power-hungry graphics adapter. I've had some compatibility problems with the NVIDIA drivers
, but great luck with the AMD Firepro V4900, which is about $150.
If you're building a new computer, you should also know that LR has a hard time using a whole lot of cores
Of course, all this could change with future releases, and the kind of processing that we're talking about here is pretty easy to parallelize.