Neither, Nexus 7 2013. $229 iPod touch 5G 8gig vs $229 Nexus 7 16gig is a no brainer. And I hope you were not talking about the $299 iPod touch. Why would anyone pay $329 this late in the game for a year old iPad mini with 2 year old iPad 2 guts? If your determined to stay in the Apple ecosystem then just wait. That's the best honest advice anyone will give you.
Gotta to tell you that the ipod touch and iPod mini are in different categories. Otherwise I would not have mentioned the Nexus 7.
Well after seeing your signature, for what do you need an iPod touch? Having a 4s and two ipods makes no sense for me to buy the touch. The ipad mini will fit you better i think, it has old hardware but runs perfectly. But, if i were you, i will wait until september cause we probably see a new refresh in both touch and mini.
Since you have an iPhone, you might want to consider the iPad mini unless you want the extra portability of the iPod touch.
I presume that you will get your next iPhone with more storage space.Well, I am looking to sell my other devices in favor of the upcoming "iPhone 5s" and need a new device with more storage. Thanks for the advice, though.