I use a barlowed laser to collimate my 12". Obsession telescopes have a great article on laser collimating using a barlow lens.
http://www.obsessiontelescopes.com/l...ml#Collimation
This method negates the inherent slop between the laser and the focusser (slop=inaccuracies in collimation).
Enjoy your 'scope. I know I have mine for the past 2 1/2 years!
