I can tell you straight out that the nano isn't fragile. I drop mine almost everyday. It's very solid. Checkout what these guys did to a nano

http://arstechnica.com/reviews/hardware/nano.ars/3

As you can see it's pretty tough.

The sound is good. I use great quality mp3s (Lame alt preset standard) and very good iems (Ultimate Ears Super Fi 3)so the sound is pretty sweet to me.

There are tons of pros. It's easy to use. Itunes is the best software period. The click wheel is a great way to navigate. You'll discover more nice little things along the way.

The only con is the scratching. After I got a case for the nano that con disappeared. I'm more than satisfied with the nano. I recommend paying the extra $50 and getting the 4gbs. You won't regret it.