That case is a ok, got plenty of features but its a bit ugly in my opinion, but everyone should have their own tastes!
DDR3 is really cheap and will be for a long while. DDR2 is expensive now. I am only running 1333mhz memory and it does me. With my HD5770 overclocked at 920/1350 from the 850/1200 stock and my Athlon X4 640 @ 3.4ghz I hit 60fps constantly in DiRT3.
I'm getting the 6870 mainly for MW3 and the X6 for the 2 extra cores (especially as I design webites and use photoshop etc a lot) and the L3 cache my Athlon doesn't have, so I get some extra umph from the processor.
The Kingston memory is ok, but I would get some Corsair Vengence, it is on offer for £31.99 (
http://bit.ly/q1MaJE) at the moment and is better than the Kingston, plus better coolers on them.
What is he going to be using as a cooler?
If their is going to be overclocking, then the stock cooler is as good as horse crap! I would recommend the Gelid Tranquillo which is out of stock unfortunately, so if you are buying now, get either the Arctic Freezer 13, or even the Arctic Freezer Pro 7 Rev. 2 which I have. Great little cooler and cools my overclocked Athlon very well for less than £20. The Freezer 13 is better, but is £26.99:
http://bit.ly/q1MaJE
Anything else I can help you with?
CinderzFTW