Regarding DM31 series units. Firstly, I have searched the site and read reviews but can't see the difference between the DM31 and DM33 (I have figured that the DM35 has digital radio) - does anyone know? Secondly, I have read contradictory reports about speakers. Some say the Mission made Denon speakers that come with the optional package are a great option because they are 'tuned' to the amp; others say go for a speaker upgrade. Any opinions, and what might a good upgrade be? The speakers would be placed on top of chests of drawers in the bedroom, only a few inches from the wall. Nothing to big. Thanks.