Here ya go:
This stuff sourced from Overclockers, you can try E-Buyer and Scan, to name but two.
Mix and match to budget and cosmetic taste. Add a floppy drive for around £7.00.
You could economise on the memory, hard disk and video card to get a faster CPU but I think the above represents a nice balance for the money.
The Antec case/PSU comes in white as well.
Also consider a different CPU cooler to the stock one supplied if budget allows. I recommend Noctua, Scythe, Zalman and Thermalright.