I would definitely buy from a dealer who offers free New Owners Classes , service and warranty.
ive had HandiQuilter for 15 years- upgraded my first one to an Avante a couple years ago. I do not have a computer system. Customer service from HandiQuilter has been wonderful over the years- along with service from my local dealer. I know they have special classes for the people with the computer system.
That being said- a long arm is a big investment. It is best to visit as many shows- dealers as possible and try out the different machines- just like buying a car; not everyone likes the same one. Take the time to try them out- find what is going to be best for you.