To augment what @benfifield said about Premiere Pro and video cards, my experience is that the number of CUDA cores on nVidia cards makes a big difference for transcoding. The card you selected has 512 cores but there are others that have upwards of 1500. While not all of them are on the ‘approved’ list, it’s easy to edit the cuda_supported_cards.txt file to add them and get the benefit of the hardware cores.
My last video station build several years ago ended up with an nVidia GTX 660Ti for its 2GB DDR5, 1344 cores, and being very affordable. There are newer cards with more cores these days. For example, the 980 Ti has 2816 but goes for $700-ish. You can comparison shop at: http://www.geforce.com/hardware/compare-buy-gpus to make a CUDA cores vs price tradeoff.
Note that your Quadro card offers acceleration for Speed Grade (GeForce cards don’t) so if that is really important for you, you’ll probably want to stick with the Quadro card.