I started out with a computerized 16 inch throat on my used long arm. I upgraded to a computerized Q'nique 21.
Personally, I cannot imagine quilting on a computerized long arm with a 9" throat. Yes, I am spoiled - but I have health issues that limit the time I can a spend doing the actual quilting, so the larger throat has become a 'must have', not a "really want".
When you are ready to buy a long arm, Take a look at used aka pre-owned long arm set ups. You can get some real deals.