I would keep the Thorens TD 124. That thing is ugly looking, but seems to sound marvelous (with the right plinth + calibration).
The first step is admitting you have a problem......
OK, so now on to step two: What to do about it?
I would recommend selling the ones that will net the most return on your "investment" without deminishing your listening pleasure. In other words, sell the most expensive ones that you don't think are the best.....
Here's my* biased opinion. Keep one or 2 of YOUR favorites. Sell the rest. Keep in mind you may not get as much $ as you think they are worth, especially the cheaper, crappier ones.
Then, buy a Lenco for a DIY plinth project, or buy one of mine (*bias). If you are deeply into vinyl, the Lenco will will destroy everything in your stable.
With all those tables, it looks like you have the experience to set up a Lenco and get outstanding, musical results.
Also, keep one or 2 of the best arms and you can experiment. The Lenco plinth is ideal for arm/cart changing.
Regain your sanity. Get a Lenco. Then you will be a mere lunatic.
I have heard most of of the tables you are looking at. I think the Linn is the table to have if it's in your budget. The other tables should cost much less with the exception of the Thorens 124. I'm not personally sold on the rim drive method of the Thorens 124 but there is a new following of that technology. I have a manufacturing friend that tells me I really need to give the rim drive another listen because the idler wheels that are available now are better than technology 50+ years ago. That table with an SME 3009 was a very good combo in it's day and is today but will it beat out the Linn? Hmmm. I believe in the suspension tables. Almost all the other tables you have on the list are direct drive tables for hard suspension belt drives. I think they are very good but they are more mid fi with a couple exceptions like the TD 160 which can sound really good with the stock arm and right cartridge.
I like tables with a 3 or 4 point suspension. Yes, it shakes for a few moments after I set the arm down but it only last about 2 to 5 seconds if that long and it is more silent than the tables I have listend to without suspensions. I enjoyed my Sota Sapphire I owned during the 80's. You could literally take your fist and hit it on the sides and the needle wouldn't miss a beat. Try that on todays non suspended tables. I think the Linn if set up properly will yield the best soundstage, depth and presentation. Second the Thorens then the Thorens TD 160, 165, and so on.
You should go into Rehab to tame down this addiction of yours. I'll send you a link where you can sign up. Be sure to pick the second batch so we can meet there.
Seriously speaking, Since you give credit to the design philosophies involved and If these were mine I could trim it down to 3.
1. suspended: linn or thorens 160 series
2. Direct drive: technics 1200
3. Rim/idler drive: thorens 124
Time will come when you know which one you can let go.
For some insight on the Thorens TD124, go to Stereophiles website and do a search for Art Dudley's columns on his meticulous restoration of a TD124. He certainly didn't start with NOS in the box, yet he has abandoned all his previous TTs in favor of it. YMMV of course, but the articles are informative and enlightening just the same.
I concur with the idea of keeping this one and getting a good 12" arm for it.
Ah, the GSXR encouragements are not helping, since I have wrecked a couple before, and the girlfriend is not liking the idea that I have been looking at a couple lately :). The hardest thing with the tables is that I like them all, they all have something about them that I really like. They are the most fun component I have.
Personally my favorite is the Td 160. In part because I am really impressed by the Thorens, and in part because it is the best looking one out of the group In my opinion. It is black with a mirror polished platter, and unfortunately I hear with my eyes more than I probably should. I am going to try and use the same arm on a few of the tables to see which one truly sounds the best. At this point my analysis is highly flawed as they all use different arms and cartridges.