I'm a big fan of the SPIGEN Neo Hybrid. It's a little pricey, but it looks sleek, has a pretty substantial soft TPU cover without adding a lot of bulk, and seems like it will add a moderate amount of protection.

I'm on my phone now and can't get a link to it easily, but would recommend at least checking into it. (Edit, link: http://www.amazon.com/gp/aw/d/B00EV8Y6QQ/ref=mp_s_a_1_6?qid=1384013335&sr=8-6&pi=AC_SX110_SY165_QL70)

There are some complaints about the S4 version breaking easily around the USB port, but I haven't seen any yet for the N5 version.

My only other potential complaint is the headphone jack port is a little narrow and may prevent some of the bulkier headphone plugs from fitting. Haven't had an issue with any of mine...yet.