I've got a powerpro r12:17 and I love it. Bought it in January.
8GB ddr3 1333mhz
ocz vertex 4 SSD 256gb boot drive
750 gb HDD media drive
My only regrets are not getting the 90% color gamut screen and not getting the SSD when I bought the computer, I added it a couple weeks ago.
Get the powerpro and get make sure you get a SSD, if you weren't already planing on getting one. It's the best upgrade I've ever made. Also, I haven't felt the need for any more than 8 Gigs if ram, the most my system uses is around 5 gigs.