Anyone know of a good Nexus 4 case?

I'm getting kinda tired of just how slippery the back of the Nexus 4 is, I can't seem to put it down anywhere without it sliding around. I really didn't want to cover the back of the device, but if I don't do something about this now, it's just a matter of time before I crack the glass.

I don't think the bumper case is gonna solve my problem, but it would be great if it did because it wouldn't hide the back of the device. Would anyone that bought the official Bumper case care to provide any comments on it? There must be something good about it if people are shelling out $60 for one on eBay.

Aside from the official Bumper, has anyone got a good case for their Nexus 4 yet? I'm looking at some S-Line TPU Gel cases, but I need to see what it looks like on the phone before I buy.