I'm new to Mac Pro, but would like to build a powerful enough machine for Lightroom\Photoshop use which will last few more years. I have laying around 6-core Xeon x5670, ATI 5770 1GB Video Card, 24GB DDR3 RAM and PCIe SSD. What Mac Pro will be the best to put it in? i.e. 2009 or 2012? Or, for my case/purpose they are the same, and the cheaper I get barebones the better? Thank you!