Is a Linn Sondek LP12/Lingo/Ekos with a Cirkus update, the last turntable I’ll ever buy?

as far as the technics tables, you will have a hard time finding a table that is as true to the source for the money than the Technics. If you like coloration, by all means most belt drives will give you that softer warmer presentation. However, if what you are looking for is what is really in the grooves, the Technics tables will get you pretty close. I honestly could never go back to a belt drive design asa main table after hearing the Technics. Maybe an Idler drive is more of a compromise and they can sound fantastic, but most are older and may need a little tender loving care.

I can tell you that the Denon 103 sounds fantastic on the 1200G.  shockingly good.  you have a good plan there. 

Could be.  just make sure you are ready to deal with tuning it every time the wind changes direction.

Linns can sound great if set up properly.  I would look into setup and getting that set up jig if you are serious.  

I think the Linn would better the Clearaudio if set up correctly, like with any turntable, setup is key.

I tried my Arche headshell and it was too heavy.  the LH 4000 produced better results with which I was surprised.