Ok looking some things over I think the Core 2 Quads are probably still your best bet.
Basically Intel has two Quad core lineups right now, the Core 2 Extreme and the Core 2 Quad. The Extremes average at about 25% faster but are also about 400% more expensive. The suggestion I would make if you want to go Quad core is going with the Core 2 Quad Q6600, its not the fastest out there but its pretty high on the list and still manages as fairly reasonable (considering what you're getting) $280USD & $139GBP price tag.
Also I wanted to note that newegg doesn't have international shipping so TigerDirect is probably our safest bet for now. Hopefully Scan will have competitive prices and it will be a moot point but I'd rather build based on info from a site you could potentially order from than not.
Anyways the Core 2 Quad Q6600 is definitely my suggestion for the processor since you want quad core and the price doubles for the next highest Quad core from intel and it doubles again after that to get into the Core 2 Extreme processor line.
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