For those who don't know, the comment above is from the inventor of Teleportation, Flying Saucers and Codename (Yes, really, Codename) White Poppy.
http://www.machinadynamica.com/index.htmlGood luck tawa finding someone credible who has tried all those. Two things you might want to consider in choosing where to spend your hard earned Federal Reserve Notes. All the Synergistic tweaks are super easy to try and then remove and send back if you don't like them. 30 day money back guarantee. And you will know right away, because with ECT and PHT there is zero break-in time. Even assuming Total Contact is as great as its many satisfied customers claim, they also are very clear in saying it takes quite a while to settle in. How long do you plan on enjoying music? Six months or a year or three from now when you may have sold or traded components you will still have your ECT or PHT to tweak the new gear. Meanwhile whatever you had left of your Total Contact will have long since gone bad even if you did try and carefully preserve it in the fridge.
If it was me I'd start with the ECT. They are just so consistently effective and easy to use on so many components. Next would be a toss-up between PHT and HFT. Between those two the deciding factor for me would be which do I think is likely to be improved the most? My room is pretty well dialed in acoustically, and I am free to do more of whatever I want. But if I had a room with problems, and especially a room where I had to be discrete in treatments, then I would probably want to try HFT first.
Either way I always go into it knowing it really doesn't matter what anyone else has said, it only matters what I hear in my system. And if what I hear sucks then I want to be able to send it back. Because, much more often than not, that is what happens. Can you do that with Total Contact?