So I already ordered a Beyerdynamic DT990 Pro 250 which will be for my home use, but currently I'm looking for something that I can use on the go. Portability and noise isolation would be nice, though honestly I'd consider anything under 100. Also they must be pretty durable and can work with an ipod nano. Currently the ones I'm looking at are:
AKG Acoustics K240 - $80
Koss PortaPro - $33
Sony MDR-V6 - $77
Grado SR-60i - $79
Fostex T50RP - $84
Shure SRH-440 - $78
Music I listen to is pretty much all genres, but quite a bit have female vocals. Reasons I'm considering the bigger headphones is because I might consider trying out modding later on. Also I currently have no portable amp. My preference is toward over ear rather then on ear, but the price tag of $33 vs everything else is kind of hard to just let slip by. Also I live in Hawaii, so it limits a lot of online retailers, most of these prices are based off of Amazon. Thanks for any input!
Right now I'm really leaning towards the KossPortaPro or the AKG K240.
The Porta Pro sounds great for the price, but isn't very sturdy and will leak. The AKG has an OK build and will leak a bit--if that will work for you it's a good choice. The Shure is a good can in this class (at least as good as the Sony) that is very solidly built and is closed. The Grado leaks a great deal and has comfort issues for many.
You may also want to take a look at the KRK KNS6400, is its available to you.