If possible try and get a 7600 GT
http://www.ebuyer.com/UK/product/111198That processor might be a bit sluggish, A 3500+ or 3800+, or perhaps 3800 X2 would do a better job. Im not saying that what you're buying is slow or anything. It will be a nice computer. But there are some things that should be improved upon.
Motherboard will do fine. Just read a few reviews on that particular one and no one is saying anything bad about it.
All processors today you will buy will be 64 bit. So don't judge on that. Now our next thing is RAM.
Currently RAM's prices are very high, like some almost double. It drops back down after christmas or around the time.
http://www.ebuyer.com/UK/product/92877Corsair Valueselect is good stuff. I use the DDR version of that RAM in my current system and I have no bottlenecks or anything.
I would suspect that this computer you have listed will run oblivion very high graphics.
Buying the 7600 GS and the AMD 3200 will leave plenty of upgrade room in the future if necessary. And that will be awhile away.
Also be sure to get a SATAII 3.0 GB hardrive.
But things are lookin' good!