Hi
I thihnk the person who said, glass pre plus SS power has a certain something is on to something there.
SS power does develop better bass than will tubes.
I've been in the process of discovering myself. for some eyars now, and when I get the notion I need to change something I really enjoy 'as is', somethings up besides sound quality. as said, change for the sake of change points elsewhere. not at the system.
the second astute point made was about the apparent sole source, the CDP.
I've been all about the source being the key to any outfit. the better or deeper into those waters one can get, the better.
transports just do not age well or last forever. along the way the resolution slowly declines and one gets used to that sound as it dies. replacing it holds a whole new bag of worms waiting for it to break in!! I went thru that with a Sony XA 777 SCDP.
given the orig Q, I would say....
If at all possible put some $$$ into a DAC which gives you options with more sources and formats, and an upgrade or update path from the maker.
Or...
don't trade or sell off something to buy another something given you enjoy what you have now. simply wait a tad longer and 'add' a new piece to the existing rig.
having on hand a second preamp, or amp of differgin topologies and or brands is always an outstanding option.
if a DAC is not the top choice, I'd go in for an SS amp. great bass does so much for the things residing above it, its nearly a 'must' have thing for me to dig a rig.
of course, there are other areas where one can pitch money and as such, improve or re-arrange one's SQ. Isolation. cabling. racks. Room acoustics.
all that said, I do dig where this is coming from completely.
I finally had put together the best sounding rig I'd ever owned and then sold it off just to try an all tube affair. that one turned out just as good but in a different sort of manner.
for me to be able to have no further arguments on which this, or what that, I need two separate rigs. one all tube, and something else.
... but that's just me.
good luck