That is indeed the table I would go for, the SLM3. But it looks like it’s designed for a Pmount cartridge. Would you know if it accepts more current standard cartridges?
Cool. Nothing wrong with a P-Mount cartridges if you don’t mind to buy some of the best from the golden era. I bought my first P-Mount cartridge this year for use with pivoted tonearms. And i’ve seen many great p-mount versions from Technics, Stanton, Pickering, Audio-Technica ...
The solid build of the SL1200 makes it a keeper. Thus, I was thinking of keeping the unit and just changing the arm. If the SLM3 can accomodate a normal cartridge, I would be a definite option.
I have two SL1210mkII (not in the main system), they are upgraded, but still with stock tonearms. Using many vintage tonearms in another system i’ve noticed some of them could be great for Technics. Linear tracking tonearms are normally monsters, i never thought about them for any turntable. Conventional pivoted tonearms are great and there are many within your price range that can be used on SL1200mk5