hey guys, would like to ask, any difference between the nwa-a15 (the Rm499 very tempting ) and ipod touch in terms of sound quality/output? I know the sony has the Hi-Res audio thing but never use it before so any feedback on that? or anybody coming from ipod touch to the nwz-a15? thinking to ditch my ipod touch for the nwz as i find using itunes to transfer the music a bit troublesome lately