Best turntable for the buck

I now amazingly find that my analog system has fallen behind my digital system in  SQ and I want to investigate how to improve it. 
Currently I have a heavily modified Rega RP3 turntable, with two power supplies, a new platter, sub-platter and other internal enhancements. My cartridge is the Clearaudio Virtuoso.
Not that it’s bad, but I want to look for  something that will significantly improve the sound of my current setup. 
Will about a 4K investment do that?