I found it on newegg for $4000 (assuming I'm looking at the right computer). If you figure £600 - that's about $1000 (assuming my math is right). That's 4 years of "new computers". I don't think in 4 years, your "i7 equivalent" will be out-performing it by 'that' much.
Although to be fair technology jumps exponentially but a few simple upgrades and I'd think they'd still be fairly even....at least I'd hope if I spent $4K on a pc.
