I recently got a 1 gig shuffle as a gift to replace the CD walkman. I listen to music on public transport and while walking and biking. I have debated exchanging and rading up to the 1 gig nano, but do I really need the screen? I have read conflicting reports on nano durability, I need my player to withstand being in a pocket on a bike ride at the very least. I do not need to keep my whole music collection on the player, most of it stays in iTunes. Does the nano have other advanteages over the shuffle besides the screen? Gracias.