I have selected these parts so far:
from
mini-itx:
EPIA EX 15000G C7 Mini-ITX Board £158.63
Morex Venus 669 Case - Black £69.33
1GB PC4200 DDR2 533 DIMM £69.33
Serial ATA Data and Power Cable £5.88
from
ebuyer:
Hitachi Deskstar 1TB SATAII £225.36
NEC Optiarc AD-5170A-0B 18xDVD±RW DL Black - Bare Drive £16.87
Microsoft Windows XP Media Center 2005 £67.00
Total: £612.40
The major cost seems to be the 1TB drive, 1TB may not be enough so i will need to fit another drive inside in the future, so hence the single 1TB drive.
I guess i want to hear peoples suggestions, before i put the orders through.