I currently have 6 haha. I also just got my i5 Ghost Armored so probably won't be using any of the cases for a little while. First case I bought was the black Griffin Reveal from Best Buy. Then went to Verizon store and bought their black silicone cover case. Couple days later I was in Target and purchased the black BestCase Apple Bumper replica and a black BestCase snap on case. I ordered the Gear4 clear back case and received it a few days ago, it's similar to the Griffin Reveal but has more rounded edges, the clear backs on both scratch very easily though and look like crap after only a couple days of usage. Then read about the Incipio Frequency case at RadioShack and picked one of those up, love that case and it came with a screen protector and a little plastic stand. My order of favorites cases so far are as follows:
1. Incipio Frequency
2. Target BestCase snapon case
3. Gear4 clear back
4. Griffin Reveal
5. Target BestCase Apple bumper
6. Verizon black silicon case
I will be rocking my iphone 5 with just ghost armor though, I love the grippiness it adds and although it may not be the greatest protection against drops, it works perfectly against scratches, nicks and you can set your iPhone down on any surface without worrying about the aluminum getting beat up.
Incipio frequency and the Photive bumper. I've been using the Frequency more, but I like both.
I will probably get a higher end case when they're released. Maybe the updated Graft Leverage (I had one for my 4S and it was my favorite case)...and, maybe, if I break down, I might pick up a Deff Cleave. The one for the 5 is SO sweet looking.