Should I stick with my old TT or buy new?

I have an old (26yrs.) Technics SL1700 direct drive TT in mint condition. I had it upgraded with a new Rega cartrige and Linn phono cables a few years back and it does sound OK to me. My question is - Is it worth it sonicly to take the plunge and buy a newer design with current TT technology? Are newer turntable really in that much of a different league as old ones? I am considering the Clearaudio Emotion/Satisfy/Aurum Classics Wood cartridge combo.

Any thoughts would be greatly appreciated