Time to upgrade the old Dual turntable, looking for opinions.

I bought my Dual CS-522 turntable new back in 1980 and it's well past time to think about upgrading. This model was more or less at the bottom of Dual's range back then, but it fit the budget. One of its interesting quirks is that the platter was never totally flat (these were stamped platters, not cast ones) and even though I replaced it about 12 years ago years, it's improved but not perfect. Our vinyl collection, comprising well over 400 records, has remained largely idle for many years but it's still with us and really needs to be heard. So, I'm curious to get some opinions about what modern (or for that matter, vintage) TT's might be a significant upgrade. Hoping not to exceed $1500 for this, but can stretch a little in the right circumstances. (Finding a significant upgrade for my ClearAudio Micro Basic phono preamp is a separate project, but we'll get to that).