I have 6 SATA ports on my mobo so here is my idea.
Go to eBay buy 4x SATA-CF adaptors, buy 4x 32Gb CF cards and 2x 1Tb Samsung F1.
RAID 0 the CFs to form 128Gb SSD and use the 1Tb drives to take over storage from my 320Gb disks.
Total cost: 4x £6 + 4x £74 + 2x £93 = £506 inc VAT and delivery
Looks like I'm gonna be saving up again