Lol, I doubt I can remember them all, and if I could it might be easier to list the ones I haven't tried. Also, YiHi makes their boards available in the market and I have built a few, mostly in wood although I have done a few 3D printed.
Yes, the metal makes a difference. I use Stainless because it's the best flavor I have found, although there are people who do not agree, and others who would award the title to titanium. If you have the option-- you're not a coil builder, right? you use drop in or pre-fab coils?-- try some with different metals to see what you like best. It might open your eyes.
I was an early adopter of TC-- I hate to think what I paid for that 200W Snow Wolf V1-- but the very first boards could only use nickel (Ni200) wire and it tasted so horrible I quit TC almost immediately and didn't try again until I bought a mod that could TC SS wire. I'm sure I still have several spools of Ni200 wire laying around somewhere-- doubt I used as much as 6 inches of the stuff-- which I would be happy to donate to the cause, but I honestly don't recommend it
I have an SX mini as well, and it's also one of my favorite mods. Don't remember what class. LMNOP maybe.
You might want to get verified on the classified ads board here. One occasionally sees an SX pop up in the classies. Also, thevapetrader.com list them from time to time. You can also find them on eBay, but that can be iffy unless from a verified seller.
Finally, I'm not an expert on this stuff, but the people I know who do use TC generally tell me they like the DNA boards better than YiHi: more stable TC and more bells and whistles to go along. They're not cheap, nor are mods containing them, but one of these days you might want to try one. Next time you visit your local vape emporium you might see somebody with one. Most people will let you hit their mod if you carry a spare drip tip in your pocket.