Please look at the information on the A-1 Longarm quilting machine. I have tried all of them and this is one of the smoothest, easy handling machines I encountered. In addition, this comes with an optional computer driven unit. That, too, is one of the best I found.
The best way to make this size decision is to do web research first and then go to a large quilting show where the major vendors exhibit and test drive them all.
Do not necessarily make a snap decision and try them each several times over the length of the show. Then talk to them about leasing.
Best of luck