I use the Otterbox Defender... I probably don't need that level of protection, but the case feels and looks great. The weight doesn't bother me, I like feel of the phone in the case better than with no case, which feels very fragile/cheap to me. The case provides excellent grip. Holster works well too.
I have also used the Seidio Active case, which is considered to provide good protection for people who don't need Defender level protection. Case and holster are both lighter than the Defender/holster, holster is good. This case feels kind of spongy or loose to me though, not as solid as the Defender, which is why I switched.