http://www.mqsshow.org/ MQS (machine quilter's showcase) is coming up in Wichita KS if that is close enough to where you are in CO. It has lots of machine quilting classes and vendors.
I recommend
www.mqresource.com which is a machine quilting forum that has members with all different types of machines.
I bought a used 2003 APQS Millenium from a dealer in 2009. I have had no problems and great service from the company.