Could use some insight on my first build.

Approximate Purchase Date: within the next month I plan on purchasing the initial pieces.

Budget Range: Preliminary budget is about $600 Before Rebates

System Usage: Gaming mainly mmo’s with the most demanding being SWTOR, programming, movies, internet

Parts Not Required: for the preliminary build I will use my current hard drive, psu, optical drive, and gpu. I will also not need speakers, mouse, keyboard, monitor, etc.
PSU i will be using= Thermaltake 600w PSU
Graphics card i will be using= XFX - Radeon HD 6750 1GB DDR3 PCI Express Graphics Card

Preferred Website(s) for Parts: MicroCenter preferably, but any will do

Country: USA

Overclocking: Maybe

SLI or Crossfire: Maybe

Additional Comments:
I am basically trying to bring myself back into a modern era of computer usage, and allow myself flexibility in future upgrades. What I’ve planned to do is purchase a new CPU/MB/Case/Cooler/Ram in combination with parts I currently own to create a basis for future upgrades. After this initial build I most likely do routine upgrades as money becomes available (i.e. hard drive and os upgrade will be the next step).

For the first phase, I was looking at the following parts....
CPU= i5-2500k
Motherboard= Gigabyte GA-Z68MX-UD2H-B3 (initially found on microcenter, cannot find the link at the time of this post.)
Case= Thermaltake A30
Cooler= GeminII S
Ram= ?

All I know about building computers I have read in reviews and articles and only have very minor hands on experience so any input or suggestions you may have would be greatly appreciated.
Disclaimer= I do have an experienced home pc builder whom will be guiding me through the actual build process.