Want to upgrade turntable next year, upgrade path?

Hello everyone.  I'm a long time fan of vinyl but just recently bought a new integrated tube amp and speakers, and now realizing how good things can sound, I'm kind of hooked...shocked? haha.

Current setup:

Rogue Audio Cronus Magnum II  amp
Klipsch RP-600 bookshelf speakers
Technica SL-DD33 turntable
Blue Jean Audio interconnects
Chrome Cast Audio

I know there's probably a lot of things I need, subwoofer definitely being one, and maybe would be a better purchase prior to the turntable.   I also want to pick up a new DAC to use with the CCA. I've been looking at the Shiit Audio Modi Multibit. I've been looking at a new power cord as well for the Magnum II, as I've heard that it can make a difference. (skeptical on this! haha)

My budget for the turntable + tonearm + cartridge would be about $2000 .  I'm not opposed to used equipment at all. 

Thanks!