How cheap do you need? In the very cheap category, the WD MyBook Studio Edition (with FW800) should fit the bill.
I mainly use them for backup, but I have edited with them in a pinch (including DVCPRO-HD and 8 bit Uncompressed) and have not had any problems. Should be fine for DV.
Apple Store has the 1TB model for $200. You can find them cheaper if you look around on the web.