$700 Used TT Upgrade Advice, Is it Worth It For Me?

Looking for some advice: I have an Audio Techinca At LP240 that has a AT 120 cartrige with new stylus and fully manual.  I am a bit of a TT newbie but like quality audio pieces. Would like to upgrade and spend about $700 for a used turntable.  Currently I have 110 wpc integrated Luxman L-509u with MM/MC selection and Revel F50 floor speakers.  I stream most of my listening via a nice DAC but like to listen to an vinyl album once a week.  Most of my vinyl is classic rock with some newer adult alternative and don't listen very loud any more. I had a little issue with rumble when playing loud but resolved it with 2 raquet balls cut in half, filled with insulation foam, sanded flat, put on audio stand,a large piece of travertine sat on the semi spheres and TT on the tile piece.  $10 DIY was very effective.

A few local listings are:
 
1 REGA PLANAR 3 TURNTABLE WITH RB-300 TONEARM, REGA ELYS 2 CARTRIDGE  $700
2 CJ Walker CJ55 turntable, Infinity Black Widow arm with  damping trough, new Cardas wire from headshell to phono plugs  $600
3 Thorens MKII TD145 turntable looks stock around $550

Would some of these selections be worth pursuing or am I already in the same league?  Also, I am not looking for a finicky TT or a project that needs to be upgraded like nice table but no tone arm.