My choice is finally fallen on the 2-pack Essential Belkin, since 2008 I have bought Belkin silicone sleeve already for my first I Pod touch and am still amazed at the quality.
The case fits really perfect and provide excellent protection for the iPhone. The only drawback is that silicone like attract dust, but as I do my sleeve and my phone anyway cleanse the week for reasons of hygiene 1x, is that's OK for me.
Conclusion: 5 *, absolutely recommended!