Since you already have an ipod you really don't need the iphone for a music player - for that reason I would get a Droid 2. It would also be a good choice if you want a physical keyboard. Other than that it's up to your personal preference between iOS and Android.

I'm renewing my contract and am unsure as to whether I should go for the Droid 2 or iphone 4. I love the apple products, I have an Itouch, IPad, & Nano, but I am really interested in the Droid and it's features. Any advice??