If you are thinking about buying a used Triad, I wouldn't. They sound quite nice, but are very heavy, and due to the somewhat mismatched speakers and unusual crossover/hi passing/low passing design, there were lots of reports of blown drivers (I think primarily the 10" driver).
If you already have the Triad cabs, the Mesa2000 is will drive them, and almost any other cab (given the massive EQ capability of that head) quite nicely!
I had a 2000 quite a few years ago, and it sounded good with pretty much anything, and had LOTS of power. Any high quality 212 or 410 would match up nicely with that head. I would recommend the Bergantino HD212 or Baer ML212 if you want a nice, big, wide open but controlled tone (if you have the cash).
Last edited by KJung : 01-18-2013 at 08:59 AM.