I want a good computer with good memory for gaming and music etc. but it cant cost too much.. please help!?

My birthdays coming up and i want a new desktop PC. i have a laptop but its failed on me countless times and i want something a bit more suitable for what id use it for. i need a computer with good memory, so i can download numerous games and songs without my computer getting too slow. i still need something... show more My birthdays coming up and i want a new desktop PC.
i have a laptop but its failed on me countless times and i want something a bit more suitable for what id use it for.
i need a computer with good memory, so i can download numerous games and songs without my computer getting too slow.
i still need something that is compatible with msn messenger etc, and simple webcam connections (ive heard macs can be a bit fiddly in this area).
i need something that isnt REALLY expensive!

any recommendations please?
thanks!
Update: id say my budget would be £450 max.
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