You've probably gotten a case by now, but I would say the 3 most common
would be Body Glove, Seidio and Otterbox. The Bodyglove tends to be pretty
bulky, where the Sedio is usually a bit more sleek. Otterbox, I feel, is also on
the more industrial side. Of course there are different models and variants
between phones.
I bought the otterbox commuter after having a cheap basic plastic case. The body glove
seemed to bulky ( especially with the belt clip). I just bought a Sedio case for a
friends Droid 2. It is a slim, sleek case but I'm not real convinced about
protection. The otterbox has plugs for the headphone, usn and hdmi port.
This is a nice feature imo.
All in all, the Sedio is more attractive, but if my phone is going to be
dropped, I'd rather have the otterbox commuter.
hope that helps someone!