That's what I'm planning to do imminently, just buy 2x 250Gb HDDs and copy my essential data over, then clone my 30Gb system drive onto the current 120Gb secondary drive and then I will be happy for a good while yet.

Actually, does anybody know whether it is recommended to use different makes (of an identical size) in a SATA RAID configuration? I know about the compatilbity concerns of the RAID array itself, which is partly why I'm going to get a PCI card. (The other reason being that my motherboard doesn't have on-board SATA and I don't need to upgrade the rest yet)

Gareth