First Build ~$900

Hello, I am about to build my first PC. It is probably going to be used mostly for gaming and some semi-intensive cad/3d modelling. I plan on buying everything but the GPU now and wait for the R9 series to come out. I'm mainly unsure about the RAM and PSU, but any suggestions would be helpful.

Some Suggestions:

Cooler: Hyper 212 Evo.  Can't beat it's price to performance ratio.  It beats some low end AIO coolers.

PSU: 550w is all you need, even with a GPU like a HD 7970.

Ram is fine.