Hey George,
What size 2.5" or 3.5" and what's your intended usage 24/7, backup only, need removable storage? Most of the 3.5" enclosures I've used were junk, heat death traps. Others enclosures with cheap fans eventually became loud and annoying as the fan bearing wore down. I've been using a couple of IDE USB cables that have no enclosure, They simply plug into the drive and a have an extern 4 molex plug to plug into the power supply. This is nice since I change out the drive by unplugging the IDE connector and the molex plug and plug in a new drive. I don't use these 24/7 as it's only for temporary backups.
Glenn