A question i have been toying with for a long time......I have an orion one, which gets me some of the way there, but it is also sloppy in the focusser........I hence do lots and lots of star testing
TO be brutally honest, i would go the cat eye collimators and be done with it. I consider it to be the next purchase for me BEFORE any expensinve eyepiece.
http://www.catseyecollimation.com/