I prefer keeping my iPhone in an armband, as opposed to in my pocket. So far, I've bought and tried 3 different armbands, as listed below.
1)The first armband case I bought, was the Belkin Sport Armband for iPhone: $29.95
http://store.apple.com/1-800-MY-APPL...nplm=TN609LL/A
It rather quickly wore out, and began splitting at a glued seem joining 2 sections of the foam together. I had it replaced under warrantee at the AT&T store I bought it at, but the second one began doing something similar. I bought a 3rd one, knowing the 2nd was going to wear out quickly
again. I did that only so I wouldn't be without an armband, while I searched for another. My advice is to stay away from this armband case.
2)The second armband I purchased was the InCase Sports Case: $34.95
http://goincase.com/products/detail/...s-case-cl59023
or
http://store.apple.com/1-800-MY-APPL...nplm=TN570LL/A
I like the case, and it comes with a kit to apply a screen protector on the iPhone, which I did without problems. But, at the same time I was searching for and ordered this case, I also searched for and ordered another case, item #3 below.
3)My preference thus far, is the Xtrememac Sport Armband for iPhone: $29.95
http://www.xtrememac.com/cases/iphon...wrap/index.php
or
http://store.everythingiphone.com/co...-150--2782.htm
It is made very well, and seems to be the most durable of the 3 cases. Another reason I like this one, is that it lays more flatly against my arm, not protruding out as much as the InCase above. This prevents having my iPhone/armband catching on things as I move about. The only thing I don't like about this case is, that when you put the iPhone into the case (it's a snug fit) it often times catches and turns my "silent" button off. I have to make certain that button isn't off after I've inserted my iPhone into the case. But I can live with that.
I plan on trying out this one next:
http://www.hdaccessory.com/servlet/Detail?no=284