I would suggest that if you have a spare HD lying around that you want to use, then by all means get an enclosure. I've built 2 devices like that and saved money. I used the ADS USB 2.0/Firewire enclosure. The Box is rather large and clunky, cost me $59 on sale at Circuit City, but has good cooling, and an on/off switch and I put a spare 120 GB Maxtor in it. This past summer I purchased a Maxtor 80 GB External HD on sale for $80 and promptly replaced the drive in it with a 250 DiamondMX w/16mb cache for about $120. This device has no switch, is smaller and has a really unique set of metal baffles in it for heat dissipation. As I look in this Sundays ads, it would appear the the price of the externals has come down as have the internals. Price seems to be close between home built and store bought external drives. Almost a toss up now on the prices. Info: I was at CompUSA today, and they have several models of enclosures to choose from starting at about $29.