I have an A1, and have never regretted the decision! We all love our babies - I have a relative with a different brand and it feels like a boat anchor to me, but she loves it. Go to a big machine quilting show and drive them all, what works for me may not be the right machine for you. Check with the dealers of all the machines. Many dealers have current users who don't mind showing off their machines to newbies.
As for features, in addition to the stitch regulator, I'd insist on ergonomic (movable) handles and a hydraulic lift. LA quilting is very physical. Sometimes just a little tweak in the handles and an inch or two up or down once in a while will make all the difference in your arms and your back.