Looks alright. Are you planning to overclock the cpu? If so, you'll need an aftermarket cooler such as this Xigmatek Dark Knight (£35). Even a rather conservative overclock to 3.2ghz would yield a decent performance boost.http://www.scan.co.uk/Products/Xigmatek-Dark-Knight-S1283V-3-Heat-Pipe-Cooler-with-120mm-PWM-Fan-for-All-Intel-AMD-CPU
The ram you picked seems excellent, though you probably wouldn't notice any difference in performance if you went with a less expensive 6gb set. If different ram would create room in your budget for a GTX 275, it would most definitely be worth it.