As for the FEATHER case its a little pricey. I rather got with a generic, cheaper version that does the same job. For example: the Snap-on Rubber Coated Case for iTouch from http://www.everydaysource.com
And for other companies like Incipio check out
http://www.goincase.com » or http://www.otterbox.com/ for premium cases for iphones and ipods.
Hope this helps!
My iPhone was perfect for this particular case because it fit all the curves perfectly without any space left unfilled.