I bought this case from Amazon/Spigen. I have used Spigen cases on multiple phones for a while and I'm always pretty satisfied. That being said I don't have this case yet so I can't really give it my blessings quite yet.
I ordered this case. It appears to have a slim fit while still offering considerable dual layer protection. I will report back when it arrives.
I got this one with this screen protector and couldn't be any happier. Not only does this case look really good, but my Nexus 5 feels very secure and safe, and I have confidence that if I was to drop it, it would be unscathed. That screen protector is also really nice. Love the combination.
So I ordered 3 of these for store pickup and when I arrived at the store they gave me this wireless charging stand. They also gave me no confirmation of pickup which leads me to believe I may get these free. Anyways it works fine if I leave the phone in portrait mode on the stand but it will not work with this Spigen case I bought from Amazon which kind of sucks. I guess I just have to remove the case every time I want to use the charger.
Spigen Slim Armor? Amazon link: http://www.amazon.com/Spigen-Slim-Armor-Case-Nexus/dp/B00EV8Y4QI/ref=sr_1_2?ie=UTF8&qid=1394824221&sr=8-2&keywords=spigen+slim+armor+nexus+5
Usually those are pretty good for buttons.
I have the Spigen Slim on currently. I like it, the buttons feel and work great, has a nice front lip for protection, has feet around the back so when you set your phone down the back of the case does not actually touch any surface. Fit is perfect, a lot of the reviews complain about the power button but you have to install it right. I had the same issue at first and then realized you have to remove the polycarbonate backing, fit the TPU portion, then put the backing on. Otherwise the power button gets kinda smooshed.
The only gripe would be that it is obviously a more bulky case, with air cushion corners and channels in the back to route out hot air. It's the old question of protection vs bulk and I opted for more protection as I bike a lot with my phone in a handlebar mount, and an occasional crash or hard bump can send the phone flying. It does have a great feel and slides easily into your pocket however.
Also I really wish Spigen would have a clear chart on their website explaining their cases. Trying to figure out the differences is hard. They need a clear chart with bulk and protection ratings...