Nice system. I like the MBL amps.
If you cant go a little further up the DCS line, I would try the Emm labs first. Dont get me wrong, the DCS is an amazing player and has volume control (you could sell your preamp), but their single box version while very impressive, struggles with musicality IMO when compared to the higher in the range DCS which are absolutely SOTA.
I do find DCS has no "sound" although the latest range is less "cold" sounding than the earlier ranges.
If you are looking for a musical player, which with a lot of people seems to mean "warm", you may find it leaning towards sterile. If your system is well balanced it can be just the right thing.
From what I can tell the EMM Lab while not as detailed, leans towards warm in comparison. It really is a very nice player and would just slot in without much effort I am sure.
Someone has mentioned a Playback Design SACD player. I dont know it, but may be worth hearing. The only problem with these kind of companies is their value drops very quickly and may be difficult to sell later.