At your budget,I don't think you will see a lot of improvement.Just a thought.Good luck in your search.
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I'm thinking you should be able to get decent sound out of your MMF5.1. Have you checked your tracking force lately/accurately? I'm guessing you are tracking too heavy or else are too "low" in the back of your cartridge and need to raise the back of your tonearm or remove any record mats. Fact is, most of us don't have our turntables set up optimally. Play around with it and listen to the differences.
Adjust accordingly. (Really cheap tweek, zero.)