I have a Nolting with a 14' table. Love it. The one thing you must consider is the service of your machine. How close is the person that will be servicing your machine or doing repairs. If someone has to come a distance they usually charge for their time on the road and that can be expensive. Check and see who else near by has long arms and try as many as you can. If there are several with the same type of machine you can schedule maintenance and share some of the cost of travel if it is a distance. Another feature I have with mine is a hydrolic height regulator. My daughter-in-law and I share the machine and we need to adjust the height. Much easier than doing manually.
Another place to check on the web is longarm university. If you type in long arm quilting machines several will come up.
Happy shopping