I know it's out of your price range, but because you have a Denon receiver, I thought the Denon DVD-955S universal player might be a good fit. You might be able to buy one of these used or refurbished for less. I've also read good reviews of the Marantz DV6500, but that is probably still too expensive. A little more within your range is the Yamaha DV-S5770SL (~$350). If that's still too expensive, then I'll second the Toshiba 4960. I have a Sony SACD/DVD (not DVD-A) and I while it is working fine, I must say that Sony's players are rather flimsy, symptomatic of mass-market manufacturing and bean-counter profit-oriented products.

P.S. What kind of MB Quarts do you have? How do they sound? I am awaiting a shipment of QLS-830's and can't wait to hear them. I am also looking for a new amp because they are 4 ohm / 87 dB speakers, and I need something that can drive them well. The Denon stereo receivers where on my list (2-channel system).