That's a key point right there. Some people think the OP is being stubborn about not building it himself or not getting some "unknown" stranger off the Net to build it for him. From what I've read he's made it quite clear that he has no interest in building it himself yet some people on here still feel the need to shove that angle around.
I'm not advocating thorwing money away but would you spend an entire weekend painting a flat or pay someone £100-200 to do it for you? It's not like you've giving the money away but you're freeing up your own time for other things that you both enjoy and and probably better at. We recently had 2 feature walls painted and the builder did both with two coats in less time than I would've taken to do one. Looks far better too!
Paying over the odds is when you get two professional quotes and choose the higher one because you feel like it. Comparing parts of £1000 to a fully build, tested, and delivered system of £1500 is not comparing apples to apples. What's the price from Yoyotech vs Scan vs Vadim for a similar, fully built, configured, and warrantied system? That's the comparison that should be made.
There's saving money and there's being smart with your money. You have to look at what can be done in the time you spend on building a PC (for example). If it takes you 4 hours but you make £50/hr then in the time you're spent building your PC you "lost" £200 that you could've made during other paid work. Saving is not just about what you don't spend. We're getting really off the topic here though.
Back on track...
What does make sense it not paying for things you don't need. Blitzen made 4 good suggestions in his last post, all of which I agree with and are of value to the OP. Incorporating these changes would a) save money in a good way, b) not affect the final performance of the PC.