You should travel to quilt shows & dealers and try out as many machines as you can locate --- it is an investment & alot like buying a car- you want to make sure the one you get has the features that meet your needs best-you should also take into consideration customer/tech support, maintenance, delivery/set-up & owners classes.
where are you going to have it serviced? there are a number of good companies that have been around for a long-time & have good track-records- like Gammil, HandiQuilter, APQS, Nolting- there are also newer companies-
but you really should (test-drive) try out as many as you can before making that decision- & make sure you can get help when you need it- there is a learning curve- owner's classes really help and are normally free from the dealer when you buy locally. you don't want to spend such a large amount to get it home, set up & never be able to figure out how to use it....and just like buying a car= some people prefer one over another- you need to find what YOU like.