I just bought my first receiver, Denon 3802... I was using one of those Aiwa things that comes with the speakers and cassette deck and CD player all in one box... Anyway, now I need to buy a CD player. Is there anything in particular I should be looking for? Should I be interested in DVD-A and SACD? I really don't know what all that is. Are there any CD players that play MP3 CDs? Thanks.