I think that I've got what your want.
There is a nice external usb adaptor for 2.5" HD from CONCEPTRONIC.
Conceptronic 2.5 HD USB Adaptor
Isn't it? ...
I'm looking for a 100% aluminum usb drive enclosure for 2.5" hard drives. The entire thing needs to be aluminum or steel, no plastic on the exterior of the case unless its a logo or something. I have the Mapower slim optical enclose and I'm impressed with the build quality but no so much with the functionality (doesnt work at all).