Just as a follow up, I did upgrade to a Meridian MS600/MD600 combo. I now use the dac in the MS600 and use the XLR analogue output to my Simaudio P-8 pre amp. At first the MS600's analogue output remained a little on the dull/thick side but the I tried putting it on an HRS anti vibration platform and the sound really improved! Much better detail and soundstage depth. The simple act of putting a Coffee table book on top of it further improved the sound. Obviously the MS600 is very susceptible to vibrations and benefits from some tweaking in this regard.
The other observation from all this is that streamers significantly impact the sound, much like others say transports do. I tried a Simaudio MiND streamer and it sounded pretty much identical to the internal transport in my Simaudio 650 D. A much more "exciting" sound than the Meridian gear on first listen, with more high and low frequency emphasis. After a whole, though, I found the Meridian sounded more neutral and natural so I went with it. Plus Simaudio has a lot of catch up to play on the software side vs. Meridian, which has the benefit of years of investment from Sooloos.
The other observation from all this is that streamers significantly impact the sound, much like others say transports do. I tried a Simaudio MiND streamer and it sounded pretty much identical to the internal transport in my Simaudio 650 D. A much more "exciting" sound than the Meridian gear on first listen, with more high and low frequency emphasis. After a whole, though, I found the Meridian sounded more neutral and natural so I went with it. Plus Simaudio has a lot of catch up to play on the software side vs. Meridian, which has the benefit of years of investment from Sooloos.