I purchased a controller box (Pwr Supply/Geckos) with Mach3_SW and servos from Dan Mauch at Camtronics. ( http://s120220635.onlinehome.us/index.asp ) I was pleased with the product and service. He seemed at the time to be a regular on several forums that dealt with DIY CNC and Mach_SW and Gecko drives and that seems to be the case to this day but I have not been looking as hard over the last year. He had parts kits and assembled units. I ended up having to add a Campbell BOB because my laptop parallel port was outputing 3.3V in stead of full 5V TTL. The isolation of the BOB has been a comforting thing.
The after sales service from GECKO was INCREDIBLE. I had a Gecko die and I think it was my fault, and I confessed that to Gecko and they exchanged it for a new one. Seems they are that kind of a business.
Campbell Designs also treated me very well. Seems they are now making pwr supply/controller enclosures and are they primarily use Mach and Gecko as does Camtronincs ( http://www.campbelldesigns.com/ ).