Can't find shop in UK with good desktop computers

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Guest

Guest
Hi. I look for not expensive desktop computer (main unit only) for home (below 500 pounds) - but with decent power supply and motherboard (i want it to last many years), also i would like to have option of adding better graphics card and more ram to it (so i don't want computer i can't opent without losing warranty).

Problem is that no internet shops disclose power supply and motherboard types, and if they do they say "300W power supply" or "good motherboard". Also they don't want to let me open the case.

To be more specific about what am I looking for - I like this build from Dell:
* AMD Athlon II X4 630 (2.80GHz, 512kx4, 4C)
* Genuine Windows® 7 Home Premium, 64bit, English
* 4096MB Dual Channel DDR3 1333MHz [2x2048] Memory
* 750GB (7200rpm) SATA Hard Drive
* 16X DVD+/- RW Optical Drive (DVD & CD read and write)
* Integrated ATI Radeon HD4200 Graphics .
* 19-in-1 Media Card reader
Althoug hard drive may be smaller, i have spare dvd-rw so i don't need it, also i have no use for card reader.

I want to buy similar computer in UK but with decent power supply, motherboard and ability to open the box without losing warranty.

Do you have any advice where to look? And if you know any forums more adequate for this question somewhere in the internet, also let me know.