I spent a lot of time looking on eBay, Amazon, and several specialty and retail stores for a solid enclosure that was well ventilated, low profile and "a little nicer". Most 2.5" SATA-USB enclosures look the same: aluminum flask-shaped body, plastic bumpers on front and back, one LED for status, no ventilation and cheap-looking overall. This enclosure stood out to me so I took a shot.
I'm so glad that I did! Not only is the drive well ventilated with a cheese grater grill covering the top and bottom, it is incredibly slim without cramping the drive. The grill is durable enough that you can hold it firmly and not bend or warp the mesh, but if you dropped something on it, there's very little protecting your drive. It also runs through a mini-USB without need for power, if you're in a pinch. It has two LEDs tucked inside the grill that are visible from all angles. One red, one blue, each translating either power or access activity. My old PS3 drive (160GB Toshiba SATA 5400) fits perfectly and is supported by a rubberized foam bumper that holds the drive in place from the backside. You don't have to wrench the drive or force it to fit. It just slips in and stays there without feeling loose or jiggly. The 8 screws on the sides that hold the top and bottom grills to the (fairly durable feeling) plastic trim are quite small (which enhances the stealthy look of the enclosure) but you can get at them with a technician-sized Phillips screwdriver, no problem. That's the other thing, though the screws are small, they are threaded nicely and hold firm when wrist-tightened. It could use a set of rubberized feet to cushion the base of the drive but you can get those at any dollar store for change if you really want them. Personally, I like the way it slips into a pocket without them :)
I couldn't be happier with my new external drive!