I just switched from a 2011 Mac Mini server (2 GHz, i7 quadcore, SSD) to a 4 core, 3.7 Ghz, D300, Vader Mac. Obviously the Mac Pro is faster, but not incredibly so. The big difference is how it handles playback of clips with effects. The Mac Mini would stutter or hang in places, but the Mac Pro is very smooth. Motion also runs much smoother. This speeds up the workflow and makes editing more pleasurable. I found a used one on eBay for $2400. I put 32 GB of RAM in it, but it rarely uses more than 16. Go for the Pro if you can swing it, but I would have a hard time paying full price for what is essentially a three year old machine.