I've had two Nillkin cases and a PDair and none seem to suit me (I don't know why).
I had the Nillkin hard shell but I gave that to someone at work who had one of the cheap s-line cases.
Problem I have is the phone lives in my trouser pockets and with the job I do it needs some good protection but I worry about the screen with the Nillkins and the PDair is too bulky.
I've seen a Krussel SlimCover
that's on preorder with Expansys
. Hopefully it'll be out soon.
I have the PDair book style in black leather and a Nillkin gel case in grey/frosted.
If anyone wants either of them let me know (say £15 for the PDair and £5 for the Nillkin delivered to UK and maybe anywhere else depeneding on price?)
Motorola MicroTAC, SE T310, Nokia 7650, SE P900, SE P990i, HTC Universal, Nokia N96, HTC Hero, HTC Desire Z
Sony Xperia S - Replaced due to 'yellow screen'
Samsung I5500 - emergency phone (it's horrid)