Was in the local Apple store this weekend (I'm a Mac guy) and started browsing the iphone case selection on the wall. Noticed a Sena Elega case which came in several colors. Opened a black crocodile finish one and slid my Instinct into it. (Well, I pushed it because it was a bit snug.) But besides being a bit tight, it fit like a glove.
Now, two days later, after sliding it in and out a bunch of times, it's perfect. The Iphone specs show it as .48 inch deep and the Instinct at .49 inch deep (plus I have invisible shield on mine). So not that much different and since the Instinct holds snug, I know it's not going to slip out.
Height is perfect - flush with the top of the case, and width no problem as the Instinct is a little narrower than Iphone. Lots of colors and finishes available.
The case has a belt clip that swivels (they say "ratchets") so you can clip it horizontal or vertical.
All, in all, I'm very happy with it. Not a cheapie, but quality of leather and construction is great and it looks good.
Check:
http://www.senacases.com/Catalog/Apple-iPhone-Cases_5/APPLE-iPHONE-ELEGA-POUCH- Frank