The 7th Gen. Nano sounds fine and measures well. Try reading this thread: http://www.head-fi.org/t/635800/impression-apple-nano-7g-lightning-to-30pin-adapter
It sounds just like any other iPod, and pretty much just like any other mp3 player period.
It's the one player I've used more than any the past 6 months. I only have the Touch for capacity and a few ebooks.