There are machine quilting focused shows around the country. MQS, MQX, and Innovations are a few. Just about every long arm is there, as are some mid and DSM (Domestic Sewing Machines - your home machine) setups. Try to attend at least on of those shows and try every machine in the place. Several times!! With these shows, the focus is on machine quilting, and you would be amazed with the possibilities.
Good luck in your search!!