I have the Supcase unicorn beetle hybrid. Crappy name, but awesome low price alternative to the spigen neo hybrid. What i like: the back is clear matte finish, so hides scratches much much better then glossy plastic.Fit and finish is amazing for such a low price case, i was not expecting it to look so good. Had it on my nexus 5 since launch and still looks great with no longevity issues.. I was so impressed with them, i got one for my one m8 and is my go to recommendation for tablets as well, especially for kids.
Button feedback is ok. It was stiff when new, but a week or so later became much easier to push. it doesnt take alot of force to push the buttons, but you wont feel the "click" of a dedicated plastic button.
I tried the Spigen Ultra Hybrid case but I hate the smooth back (fingerprint and grease magnet). I am much happier with the SUPCASE Google Nexus 5 Unicorn Beetle Premium Hybrid Protective Case which has a matte (but still transparent) back.
http://www.amazon.com/gp/product/B00FN13QH0/ref=oh_details_o04_s00_i00?ie=UTF8&psc=1
I highly recommend pairing it with an oleophobic tempered glass screen protector, as well.
There are some Poetic cases (coming out later this month). They're on Amazon for 1 cent US (with 4.95 shipping). I have a case for my 2013 Nexus 7, it's pretty nice actually!
There's also some Caseology cases for the N5 - which seem to be well reviewed for their N4 cases.
There's also one from Supcase that looks pretty nice too...
I thought I was set on the Spigen NeoHybrid - but the redditor who posted some pics of it breaking super easy on the galaxy s4 make me really sad (because it looks very very premium, but appears to be sadly cheap for wear).
I'm really struggling here. :( So hard to choose something to protect it!