What is your timeframe and do you want to buy a SOHO or a more corporate solution (I know it is for your home)?

For alternative ways of doing this...

IC Intracom have this: http://www.icintracom.com/merchant.ihtml?pid=4395&lastcatid=:id&step=4 but I believe it is PATA. IC Intracom uses OEMs for most of its stuff, so you might find the likes of Tritton, Claxon and IOGear offering virtually identical products.

Buffalo are bringing out the TeraStation - this is believed to be SATA with RAID 0,1,5 (in software?), but no-one really seems sure.