I have Don from LDS building me a neo 610 cab, I'm going to compliment it with a mini head. I've tested the MB 500, I love it, but I see the 800 will be released sometime this year. Would 300 extra watts be worth waiting (and paying for). I know GK heads are very loud for their wattage rating, has any MB500 owners experience lack of power? 2nd question! When I buy my head, I know GK recently moved manufacturing back to the US. When ordering from RMC Audio, how do ensure I get a newer US made model?