Try the $5 hard case from Amazon
I have tried 4-5 different cases ranging from $3 to $30 and I ended up with the $3 hardcase:
(1) $4 Silicon case: it got a little loose after a few days. Would come out of the sleeve if yo drag it too fast from the pocket. I still have 4 of different color at home.
(2) $25 feather case: it is a one piece design, basically protects the batter cover but not much on the front. Returned it.
(3) Otto case: Way to bulky! The whole idea to get an Atrix is for its sleekness!
(4) $3 hardcase (black) from Amazon: I love it the best. It does not add too much to the phone (1mm) and it fits very tight! It gives enough protection on the front (the edge on the front raises about 1mm). The only caution is that once it is installed, it is very hard to remove it. You can remove it by plying open the snaps on the four corners using a flathead screw driver, but woul probably destroy the case.