The 8600 GTS may be brand new, but that doesn't mean it's a good card. I don't see why you are being a fanboy and sticking with Nvidia even when the 4850 is such a stonkingly good deal. Also, I have never had a problem with OCUK, and they tend to have great deals and cheap prices, and a wide range of products, try speccing that PC in Scan and see what price you get...

But seriously, if you think a good system consists of a Q9450 and a 8600 GTS, you really should listen to Chalex and me if you want the best rig you can buy for the money.