Funny, i knew that. Didn't notice i'd grabbed an OEM, cheers for the heads up.
Have trawled eBuyer and from a list i've not seen it's gunna cost me mroe to build the kinda system i want. I've also looked at Scan and i'm now trying MicroDirect. Revised parts list is below.
I've now got myself a 9800 GT instead of a HD4670 and i'm gunna OC it when i get it. Plus i've bought 2x(2x1)gb packs instead of 4x1gb packs and saved a little money. A different monitor and a rejig on some other bits left me enough cash to push up to the 9800GT, i'm pretty pleased. I've gone down from a 320gb drive to a 250gb drive, saved a fiver and got a better brand name. "I'd never have filled 320gb anyway" (Famous last words?)