Turntable upgrade, tweaks, or stay put?


I have a music hall mmf-7, stock with goldring eroica and project speed box. Rest of system: Wilson audio Sophias, Musical fidelity KW 500, Musical fidelity Trivista DAC, and Musical fidelity CD player. I really enjoy the mmf7 and have no real complaints. However, I know it is the weakest link in my system. I wonder how much better it could be. Do you think I would have to spend $5-6000 or more on a new tt to get significantly better sound? Any recommendations? Or would some tweaks be smarter? Or just save my money and buy more records? Thanks in advance. As I said, I like my mmf7, but wonder if I am missing out by not having something of similar quality to the rest of my system.
arsh
Look for a used vpi classic table. The vpi will be a good leap ahead of the mmf-7. And you have enough cash left over for more vinyl. That's a no brainer good luck.
I had an MM7 and once I changed out the stock Goldring for a Lyra Delos, this TT came alive. The MM7 is good enough that it will respond to and take advantage of an upgrade of cartridge. Recently, I bought an Ortofon 2M Black MM cart and this is a stunner for much less $ than the Lyra. I'm simply saying that I would not be too quick to judge that it is the MM7 that is the limiting element; it is a solid and very quiet table.
Thanks again for all the good ideas. I did borrow my father's old scoutmaster. It hasn't been used for most of 4 years. It was professionally set up. I put it in my system and put on a record that I know well, and it sounded very distorted. Since I don't think the setup has been changed, I am assuming this is a problem with the cartridge (grado reference master). Both channels play but with severe distortion. I don't remember if this was a problem before in my Dad's system; it could have been and he never got it fixed. Should I get a new cartridge? Seems I can't catch a break here! Also, I think the KW500 phono stage should work for this cartridge. It was fine with the Eroica.
The Grado has twice the output of the Eroica. Does the MF have gain & other adjustments?
So I gave the scoutmaster a once-over, and, when viewed with magnification, it appears that the tip on the stylus must have come off at some point. That must be the cause of the distortion! So, now does anyone have recommendations for a good cartridge for the scoutmaster? just stick with a replacement Grado, or something different? Thanks.