My kids have Otterbox Defender on theirs. I bought them on Groupon for $20 instead of the $50 the stores sell them for. Son's first one was a little rubbery and grippy... and he took it in and out of the case so that the rubbery part got a little loose and eventually he tore/broke a piece of it. Daughter didn't get hers until about 6 months later, and hers is the same case, but it seems they have modified them a little since I ordered my son's.
When his got less sturdy feeling (due to his actions I believe), I ordered him a new one and it is just like my daughter's. Instead of an opening over the home button (for fingerprint reading) it has an integrated plastic cover there. It is a little smaller than the first one, I think. Definitely less "rubbery".
Daughter's is purple and berry (almost looks like a wonky shade of dark blue, and then a muted raspberry accent color) and son's new one is navy with a bright (but not quite lime) green accent color. They both are very happy with them. And they both stick them in their pockets all the time. In fact, that's where my son's always is if it isn't in his hands or put up for the night.
I know for a fact they've both been dropped in these cases, and their phones are perfectly fine. In fact, one day, son was goofing around (teens, I tell ya) and went to fake throwing his phone, only it slipped and he DID throw it across the room. Luckily it landed on the sofa... we all collectively gasped.
But I've dropped it on accident when I was moving it from where he set it to charge one night. Face down onto the tile floor. The phone is flawless. Daughter dropped hers getting into the car for school the other morning (loaded down with multiple gym bags/backpacks) and it landed face down in the garage. Hers is still flawless as well.
Check Groupon out. They regularly offer these for around $15 plus shipping, which comes out to right around $20 and they arrive in about a week.
http://www.groupon.com/deals/gg-otterbox-defender-iphone-...