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#11
Let me reinforce what bobkn and the others say:
- get a "good brand" PSU - Corsair, Antec, Silverstore, Seasonic, XFX all make excellent power supplies. I would get 500-550W, but not more than that for your current needs. The PSU is the heart of your system - do not scrimp here!
- you don't mention your monitor's resolution? The graphics card you need will change (read: get more expensive) as the resolution goes up. Based on that, we could give you a better recommendation.
- get the Core i5-2500 and a socket 1155 motherboard. Cheaper than your current choice and faster in many applications, including games. If you are not planning to overclock, you can get the base i5-2500 (not the i5-2500k) and save a few more pounds. Also might be able to get a cheaper motherboard then.
- if you can, get an 80GB or 120GB SSD as your main boot drive. Your system will speed up immensely. All the big brands (Intel, Corsair, OCZ, Crucial) are good, get the cheapest one. If you do get an SSD, you may want to get a "green" HDD (one that spins at 5400 rpm), it will be quieter.
Hope this helps!