You could of course just plug it in to one of these:
Pogoplug - Bring Your Own HD NAS
Honestly, even if this had a built-in GbE port, I wouldn't understand the appeal vs. a WHS box, especially one with a 4 drive backplane and eSATA expandability like
CES 2009: HP's New MediaSmart Windows Home Server
RAID 0 gives you no redundancy and RAID 1+ requires identical drives and is very consumer unfriendly. RAID 5 is cool tech as it offers increased performance with striping along with redundancy. But for NAS, performance is almost always limited by network, and the inflexibility of RAID's hardware limitations makes this just plain unattractive to me. Also, every time I've had a drive failure with RAID 5, I've actually encountered some data corruption, and restoration of the array was more complex than just plugging in a replacement drive.
At first I was ticked off at MS for not making RAID the tech behind WHS, but I've since come around 180 degrees. I might still do a RAID 1 config on my primary desktop, just to make recovery that much quicker (and of course to insure no data loss--even with daily backup you might still lose a few hours). However, for NAS and other external storage, I just think that the add-a-drive-any-drive metaphor works better for redundancy. Drobo is cool in this way, but again, what benefits over WHS? WHS is NAS plus so much more (and for less buckage).
Now, if they'd just release a WHS box with one with one of those cool HAL-9000'esque pulsating orbs...