Hey, we sent a few emails back and forth regarding a Muse 9 sig. Which we both owned. Anyway, I sold my 9 sig a year or so ago and just bought a DV50. I can say, the DV50 is much superior to the 9 sig in redbook. I've never heard deatail, air, space this good in digital. SACD is even better.
The video section has much better depth (visual) than the 9 sig, slightly better detail, but the depth gives the images a wonderful 3d quality to them. DVD's sound super, better than the Muse again-not huge, but you'll hear things better.
Now the cosmetic part, the DV50 is built far superior to the muse. Like a piece of fine jewelry next to a wal-mart $50 watch. It's really a joy to use. You'll almost push the buttons to hear it work.
Good luck