Thanks for your fast reply. What about the other one? Sony NWZ-S744/745, does it support on the go playlists?

I am thinking to buy a NW-A845 or NWZ-S745. But I am wondering if any of these players support on the go / on the fly / dynamic playlist (whichever term is appropriate). As this is a very important feature for me, would anyone please clarify the fact for me? One more thing, are the supplied buds...