First: don't need DDR3 over DDR2 if you're going a dual core AMD
Second: don't buy a chip hoping to unlock - get the X3 instead
Third: Blu-ray optical drive is not a gaming PC and should be omitted - you can buy blu-ray releases instead
The Phenom II X2 are a great deal if you can unlock the extra cores, or what you do can only use 2 cores. If the cores fail to unlock, the Athlon II X3/X4 processors offer better performance, and much better bang/buck.
Some odd reason Chrome won't load newegg right now, but you should be able to fine both OEM and retail versions of Win7 on newegg or tigerdirect if you look into their software.