Just wanted to put my two cents in - I used this thread when I got my Razr to make a decision on what was right for me.
First post by the way! I work in construction and have my phone in my pocket a lot, go from sitting to standing, high dust environment, ect... so I wanted something quite protective. The Otterbox Commuter is by far the best cover for me - I also ordered the (Incipio?) a couple hard cases and a couple of other TPU cases. I really like how the rubber covers on the commuter flip over the power and headphone jack, as with my old Droid X sawdust/fine material would build up in the jack to the point where i couldn't use it without a Co2 spray. Also, the way the rubber grabs and seals around all sides of the touchscreen is really nice - I had issues with sawdust getting in the back of my Droid X case.
For me, this case is ideal, although it does take away from some of the aesthetics. For my girlfriend, she really likes the pink Incipio, it adds style without too much bulkiness and protection like I need. I did buy a clear TPU that I really like, but will probably never use it unless my phone needs to get dressed up for a party or something.