Few things,
PSU: You do need to make sure you're not buying a piece of crap PSU but not all off-brands are crap. There are some sites that do thorough PSU testing and if you're worried about how reliable a PSU is you can usually check with them. Like I said though, there is nothing wrong with paying a bit more for assured reliability on your PSU. If you'd rather not do a bunch of research before hand then I would go with a known brand.
GPU: From what I've seen of the 9600GT and what I know of the 8800GT you really can't pick the wrong one. Basically decide if a bit of cost savings is worth losing a bit of power and then you're good to go. As far as DX10 support goes there is no difference between the 9600 and the 8800 both support DX10. A lot of folks mistakenly think that the 9600 supports 10.1 but it doesn't. So truly the choice between them is one of budget and preference.
I have to admit I am a bit worried about your GPU brand though, I don't have any experience with them and I can't find info on their warranty policies. They might turn out to be a great savings or it might turn out that the savings comes at a price down the road. Personally I second the eVGA recommendation above, they are by far the most reliable GPU manufacturer I've found and I would personally pay the extra on the GPU since (in my rigs at least) it is the part that endures the most stress testing throughout its life and thus is the part I want to be very reliable and have a warranty for if/when things do go wrong.
RAM: I would go with Corsair but thats mostly a personal preference. Both of the sets you picked out have manufacturer limited lifetime warranties and I know both brands are good quality.
CPU: I want to point out that for gaming a big beefy CPU is not that great in terms of performance per $. This is probably the best place to make a bit of a cut if the price is getting to high. Also the site you linked to says it is out of the 8400 right now so that another reason to consider it. The E6750 is the next closest in stock and is £20 cheaper.
Given the prices we are dealing with I'm not a huge fan of the C2D lineup but you're already far enough along in the build process that its not worth changing unless you really need to cut cost.
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