you are talking about HDD space i presume
if so IDE or SATA?
if you just want space for music games work etc buy a portable hard drive! not only useful for this but also useful for back up, traqnsfering data etc.
iif youve got £100 to spend you can buy almost all of the pnes OCUK has to offer, are you planning to spend all of it or is a lower price a good thing? youve also got 2 options, you can get one that is powered by the pc and is therefore more portable ore one which needs mains power but hold more
What is Firewire connection?also do you have a firewire connection?
For £100 you could get just about any external hard drive you like.
1Tb (1000Gb) - £92
750Gb - £62
500Gb - £57.50
250Gb - £54 - powered by USB, so no power cables needed
I personally like the looks of that 1Tb drive, but for value, you can't beat that 750Gb HDD.
What is Firewire connection?