Best turntable under $4000

example of used, allows 2 tonearms: luxman PD444DD, rear can be  long arm, side 9".

start with 1 arm. add or never add 2nd arm as things develop.

more metal than wood, but very low/sleek design. needs wider area, advantage, many two arm tables are deeper than normal.

https://www.google.com/search?q=luxman+pd444&rlz=1C1CHBF_enUS949US949&oq=luxman+pd444&aqs=chrome..69i57j0i512l2j0i22i30l2j69i61l3.9693j0j7&sourceid=chrome&ie=UTF-8

this example has problems, you would need to wait for a good one to show up.

I helped a friend buy and install this with 2 micro seiki arms, there is some great engineering that is not apparent.

used, Mitsubishi linear tracking: single arm, optional auto/manual, removable headshell:

horizontal version is Quartz DD, vertical version is belt drive

I helped a friend buy/install a very lightly used horizontal model. don’t let low price put you off, it is a great performer.

again, this one has problems, just to see it:

note: wood look, not real wood, other versions exist without the wood.

vertical belt drive version

My vertical LT-5V belt drive version is shown here, in office system photos.

many people love VPI, especially older production

notice, the dust covers for this type are not included, and when made, are quire large

these, the unipivot arm wand simply lifts off, you switch to another arm-wand with other cartridge pre-mounted. I have seen/listened to these at VAS, Steve Leung's shop. Start with one arm-wand, never or add a second arm-wand as things develop

Get a Thorens TD1600 and the 2M Black. Because it has a proper isolation suspension and a beautifully designed tonearm it will out perform the other turntables you mentioned. It is handly the best value in a less expensive table. The next step up would cost you $10K.

Technics 1200 G. nothing else comes close.

you have to break down the functions of a table and form becomes low on the priority list (although the G is not bad IMHO, certainly not a deal breaker).

1) Immunity from vibration -CHECK-. No wall mounts or aftermarket isolation devices needed) 

2) Speed stability and accuracy.  -CHECK-  People underrate the effects of truly accurate speed accuracy and stability.  The G's accuracy and stability give you peace of mind and a more energetic, dynamic sound. 

3) Cartridge support and adjustment- CHECK- The G magnesium tonearm can support the best cartridges money can buy.  

4) Reliability. - CHECK- Technics decks are bullet proof and last a lifetime.  

5) Ergonomics.  - CHECK- Operation controls, cartridge installation, cartridge and tonearm adjustments are simple and straightforward.