I am not sure I understand. The jolida will not put your mmf7/goldring to shame, (in fact, it may not match it) therfore if you purchase a cd player would you have really upgraded if you already own a source which would basically shame most CD players?
In general, the same dollars spent to upgrade an analog rig yields more bang for buck than digital. If you aren't happy with the mmf AND cdp, then truly, you have to ask yourself what about your system is it that you are unsatisfied with and go from there......
I thinks you are unsatisified with your system regardless of your source...and that's why you have the bug.....
Maybe a DIY pre-amp tube kit on the cheap or perhaps EVS attenuators on the back of the amp as a passive setup (rick shultz of EVS would even impedance match the devices as best he could for you)
If you were local I'd lend you a DPA Bigger Bit dac I have for sale and let you hook it up to your CDP just for kicks to see if this approach is worth your while....
Hey, another thing, your preamp is still a tuner, even with a preamp upgrade......
BORROW or Purchase a used unit always in demand and it will cost you little to experiment. Unless your married, then it could cost you big time.