Inzer, Schiek, EliteFTS, APT, and Cardillo are all quality. That's just off the top of my head. Obviously Inzer is very popular. APT is kind of perpetually sold out of stuff, or at least they used to be lol. I have had my Cardillo belt for like 6 years or so, and I absolutely love it.
I'd go with 10mm. and of course make sure you get one that is the same width all the way around. I wouldn't worry too much about whether you got a double or single prong. I don't think you really need to wear your belt so tight you can barely get it off; just tight enough so that you can push against it and create that abdominal pressure. Lever belts are really cool also as long as you don't anticipate your waist size fluctuating often.
Now you could go with a more flexible belt like the one you used to have if you really like those. Get a Spud belt. It's like those velcro ones, except it's really nice quality. Stan Efferding squatted and deadlifted in the 800's with a Spud belt lol.