When i had my eris and also my BB's id use the hard sleeves like body glove or whatever and dump that into a holster...being a mechanic i tend to be a great stress tester for equipment
the holster/shell combos so far seem to offer the best protection for these phones that iv'e seen personally and i've used most of hte options. Body glove would be a great case if it didnt leave the screen facing out.
I purchased the snap-on hard purple case when I picked up the phone. I find it's noisy and gets in the way of pushing buttons and with typing on the top row. Most hard cases, do you think, will be the same?