I would suggest joining the homequiltingsystems group at
http://groups.yahoo.com . That is a very lively, independent group of mostly longarm quilters and I'm sure some of them have experience with the setup you are describing. Check the website's file section for lots of information about machines and frames. It's such a big purchase, and there are so many machine/frame combinations available, it's a good idea to do your research before making a decision.