Incipio G3 Cases
Today Incipio annouced an entire lineup of cases that have been certified as "Made for LG" that work wonderfully with the LG G3. They have more than three, but this gets us to 10 great options, if not more. Everything from the company's usual TPU offerings shown in the image, to the feather (thin and light) option, and even their Highland series wallet case. Incipio has multiple options for the LG G3 coming soon, so you may want to check out the announcement link and see if any are worth waiting for.
Then of course the Incipio DualPRO lineup is similar to the Spigen options mentioned earlier, delivering a dual-layer of protection. So pick what looks best to you, and fits your budget. All right from their own website.