How Much Have Turntables and Arms Improved in 35 Years

Back in 1985 or "86 I bought a VPI HW-19 II turntable with an Eminent Technology II air bearing tone arm.  Both still work fine.  I have only had to buy and install a new wiring harness and air pump for the arm.  These were very good components in their day.  My question is how much would I have to spend to spend to audibly and substantially improve on their performance?