Mine did come with a power cable. I'm running Windows 7 Ultimate 64-bit and it's brilliant! Fast and looks great. It's a little noisy but quiets down after 20 minutes or so. No PCI card or graphics card, but easily-fixed without spending an arm and a leg. Delivered in said time and I'm truly amazed with it. Totally, totally worth the small fee and more!
Came with a slight dent in the case (not sure who's at fault for that out of seller/courier) - something I'm not concerned about, but some people might be picky about.
Has 4 USB ports on the back and 2 on the front which is great. Also has a switch on the back (in-case you have kids that enjoy pressing big buttons that will keep turning your computer on!)
I'd recommend spending the extra 50 quid for an extra 4gb RAM and extra 500gb HDD, but this gets ***** for me. Great purchase.