You occasionally see used Astro-Physics AP Mach 1 GTOs come up in the IIS classifieds, and more often on Astromart of course. Again, probably a bit over budget, but bullet proof and will swing your 10KG with ease, and some. I've seen one permanently mounted in an observatory in Sydney (Marke) and I was very impressed. AP mounts are as close to turn-key perfect as you can get.
http://www.astro-physics.com/index.h...h1gto/mach1gto