http://www.overclockers.co.uk/productlist.php?groupid=1657&catid=1659&subid=1237&sortby=priceAsc
take your pick
http://www.overclockers.co.uk/showproduct.php?prodid=HD-018-AD&groupid=1657&catid=1659&subcat=1237
looks nice
iStorage IS-DG-256-SSD-64 diskGenie 64GB 256-bit 2.5 inch External SSD (google it)
or if money is really no object,
LaCie 1TB SSD Little Big Disk Thunderbolt Hard Drive
Weighing in at just 650g, the LaCie 1TB SSD Little Big Disk Thunderbolt Hard Drive is a portable storage device that fits in the palm of your hand. The LaCie Little Big Disk Thunderbolt Series heralds a new era for storage performance. Featuring a preconfigured RAID0 striped set with optional hard disks or SSDs through the 10Gb/s Thunderbolt interface, it delivers astonishing transfer rates. It now features SATA III SSDs, which deliver 35% more speed than the previous generation. You can even daisy chain multiple LaCie Little Big Disks together to increase overall transfer rates. The more products you chain together, the higher performance you get. Use Disk Utility on your Mac OS to configure the LaCie Little Big Disk into a RAID array that suits your needs.
£848.00 ish (google it) plus you need to change to a mac
will be a pc version out someday