Decision!

I've ordered the Zoostorm PC - 3.2ghz quad processor, 2TB hard disk, 8gb RAM, Windows 7 premium 64 bit, gigabit ethernet, etc. Ought to be plenty fast enough for my current and future needs, a bit more expensive than I'd originally planned but considering how much of my life is spent in front of a computer I might as well spend accordingly. Should arrive on Monday if their site isn't lying to me, we'll see how it goes.

http://www.ebuyer.com/570064-zoostorm-haswell-desktop-pc-7873-0494

They also do a version with an AMD 4.1GHz processor that only costs £269.99 after cashback, but it doesn't include any operating system. If I were building a Linux box or a machine primarily for games I'd be very tempted.

Now I need to get some CAT6 cable to run from the Gigabit socket on my router to the PC...