It depends on whether you have set up skills, proper tools and patience. If you do, lots of good suggestions above. I'll add to the Herron phono stage suggestions, no better at the price.
If you don't, get the new Rega P10 with the best Rega cartridge you can afford. Removes the most complex variables leaving you simply with VTF and anti-skating.
If you don't, get the new Rega P10 with the best Rega cartridge you can afford. Removes the most complex variables leaving you simply with VTF and anti-skating.