This is the screen protector I bought. I'm very happy with it, the installation was incredibly easy (never again am I buying a flimsy screen protector if a glass one is available!), my only tiny bubble at the corner disappeared after about a week, and the glass is much more pleasant to the touch than plastic screen protectors.
I actually bought two cases for my G4. I bought an Otterbox-like case, expecting to use this one, and a sleeker case that offered far less protection than I am usually comfortable with. I put the first case on initially, but after a few hours of contemplation I decided to be brave and put the second case on along with the screen protector. So far I'm very happy with my decision, I haven't had the (unintentional) opportunity to test the durability of the case by launching my phone across the room yet (which did happen to my previous phone, luckily it was plenty protected by an Otterbox), but I am enjoying the feel and appearance of this case far more and I'm certain this case is durable enough to protect my phone from small bumps, knocks, and drops. I assume a hard enough drop would crack the plastic shell of the case, but then again I suppose that's what the case is for, and it's cheap enough I'll just order another if that happens. As long as the glass screen protector is as tough as it claims to be, I'm confident in the current protection of my phone.
http://www.amazon.com/gp/product/B00VH1J4SU/ref=ox_sc_sfl_title_1?ie=UTF8&psc=1&smid=A8NYDTKQCUJSM these fit well for me. They had a free promotion here a few days ago and then suddenly cancelled it. Some users lost their tits over the situation. But for 16 bucks its a decent case and fits perfectly with my brown leather.
Otterbox Defender will work it is a snug fit so just snap the shell together one at a time but I do have a temper glass protector on it and removed the Plastic protector the case comes with. Wireless Charging does work for me.
Supcases - Unicorn Beetle and the Water Resistant ( better prices on Amazon and you can find the Water R on eBay for $12.xx or less shipped)
http://www.supcase.com/lg-g4-cases.html
The Unicorn Beetle comes with the belt clip and the Water R does not. You can use the belt clip on the Water R case it works fine even though Supcase will say no and you can't buy the belt clip anywhere you have to buy the Unicorn Beetle case to get it. Wireless charging works as well. Even though the Unicorn Beetle fits the Leather it's not 100% or atleast on mine the rubber shell that locks over the plastic face if you would slide your finger off the side of the case it started to come undone like I was trying to take apart the case. If you had a Otterbox Defender you might get what I'm saying how they grove on the plastic shell and the rubber lock in. I did try the Beetle with no back cover and did not have this issue. The Water R does not have this issue.
Ringke FUSION Clear (Revised Case) I have as well works fine just make sure the camera cutout looks like the one here.
Also got this one. It's a little hard to get off and want to pop the Leather back off usually as well.