I currently have this Belkin silicone case.
I like it because of the color (black/red), it's got a lot of girth to it, so I know if I drop it, it'll just bounce and my phone will be safe.
And lastly, it has great lay-on-the-table design. So no matter which way it lays down, I know my screen will not even come into contact with the surface it's laying on.
The only thing I hate about silicon cases, is that they are not "pocket-friendly." They get lint stuck to them and since they are rubber, the insides of my pockets get stuck to it and end up turning it inside out. It can be quite difficult sometimes to fish it out of a pocket when you're in a rush.
The next case I'm going to try is this one by Case-Mate.
I'm a sucker for carbon fiber, and despite this case's $80 price tag (for both holster and case), I think this one has a very sexy, yet executive look to it.
It's leather, and is textured. It shimmers so brightly from across the room. After seeing some YouTube unboxings of this case, the phone doesn't budge while it's inside. The fit/finish is superb with no sharp edges or bad seams.
The only thing I'm not going to like about it, is the fact that the top end is completely exposed (to allow the phone to slide in and access to the buttons/ports).