[mikester]

Here's what I had looked at before, apparently expandible but a bit pricey.

http://www.linksys.com/servlet/Satellite?childpagename=US%2FLayout&packedargs=c%3DL_Product_C2%26cid%3D1115416906702&pagename=Linksys%2FCommon%2FVisitorWrapper

I think it retails for nearly $800 and it's only 250GB to start with.