That looks pretty good, you might consider the Asus P5Q PRO. It's the newer P45 chipset, it doesn't really have any particualrly useful features over P35 though so not much to worry about.
The cooler I mentioned above.
The PSU is the last thing. Most people (here at least) consider hiper to be sub-par as far as PSU's go. They have a tendancy to die far before their time but usually don't take your PC with it, so that's something I guess.
Take a look at the corsair 520W HX if you are after a modular PSU. It will cost a bit more but they are pretty much silent and fantastic overall quality.
If you don't mind losing modular cables then the 550VX is a smilar unit but £10 or so less
I'd normally use Ebuyer or Scan, if you get 20 posts here on hexus you will qualify for free delivery from scan. Also if you keep an eye out on that today only page, espeically over the weekend, you will normally get the lowest prices of anywhere.