Is the ipod touch a good mp3 player to power good headphones? And which model of the Ipod does it best?

I've heard good things about it, but are there any cons it has I should be aware of? How's the bass and the overall quality? Are there any better amps for senns hd595?

I am inexperienced with audiophile matters, so I apologize in advance if I come across as foolish. I recently purchased Sennheiser 595 headphones and I am reasonably impressed with their performance. But, what amp will complement these cans? I am aware that they will not make an extraordinary...