i have read every single review of iphone cases here (and have purchased two) and none of them really suits my needs. which are (in order from most to least):

- belt clip functionality
- drop/scuff/impact protection
- complete coverage (when holstered)
- usability while in case

i purchased the incase fitted sleeve and the folio. they both come close BUT:
the folio is of almost no use in a vehicle as you cant easily open and lift out to identify a call with one hand when its not being worn on a belt/pocket/strap.
the fitted sleeve comes really close to right but it offers no robust screen protection and it doesnt fit quite as well as id like - especially with regard to the volume controls.

i looked at the uniea u suit folio which comes close but i can tell from the review that it also isnt quite right.

here is what id consider perfect:

- silicone shell (i personally consider it the best material for shock absorbing)
- integrated belt clip (ive seen TOO MANY clip on/adjustable belt clips pop off)
- top down or sideways orientation so you can read the screen while looking down at your waist
- a right opening screen cover flap with magnetic closure
- cut outs for volume, headphone, proximity sensor, dock cable and camera

DONE! i dont think any of this would prove too difficult as just about all of the current offerings provide all of these in one combination or another