If you want to view, try Digimate, the box cost around $7XX, and you need to buy a HD. I am not sure whether there are still 40G's around.
I got a 80G with Digimate III (without viewing function), just to be able to make backup from CF cards (or SD). The 3.5" HD I got is old, and the Digimate box cost $240, with one rechargable battery.