I like the look of those Spigen cases.... what did you end up going for in the end...
I've actually got one of those. It offers pretty good protection - obviously doesn't cover the screen, but has a fairly deep lip. And looks pretty decent. However, I don't use it very much because it does add a bit more bulk than my other cases, which as someone with quite small hands is a drawback for daily use, and actually is probably the least grippy of my cases to hold (which surprised me - maybe with more wear it will improve?).
The others I have are a really cheap clear TPU case that I bought before I had the phone, just so that I had something, and a Ringke Fusion (clear polycarbonate back and smoked TPU bumper sides). The cheapo TPU adds very little bulk, is quite grippy, but has almost no lip (so doesn't protect the screen at all) and, as is the way of these things, is turning yellow already. Naturally I started looking for alternatives quite quickly.
The Fusion is the one I use most: slightly larger than the TPU job but smaller than the Spigen, raised lip but more at the top and bottom than the sides, so protects the phone when placed face down but doesn't really interfere with access to the screen, provides surprisingly good grip and the smoked TPU shouldn't yellow like the clear stuff (and will be much less visible if it does).
However, I am now looking at book/wallet-style cases as well. I always do this, end up buying several cases and after a while just using 1 or 2 of them...