Grrrr, I just wrote a book to you, hit the wrong button on my iPad and lost it all! Okay, here we go again.
I have been a long arm quilter for 10 years. When I started I did not know any other LA quilters to ask for help, there was no training in my area. I purchased the A-1 and have always been very blessed with my choice since I was so ignorant going in. In your case that is more machine than you are looking for I think. Here are things to consider: TRAINING. Very important. Loading a quilt squarely is even more important than the quilting! How is your back? Can you stand on your feet for long periods of time? I can sit and quilt but I do my best work while standing. Also ask yourself, what is the largest quilt I will ever quilt? If is is just baby and lap quilts, get the smaller frame, easier to load and does not take up an entire room in you home.
If you buy used there will not be training included, and if you have to pay for training please do. I would not wish learning the hard way, like I did, on anybody! There are some good DVDs also, Linda Taylor comes to mind immediately, also Jamie Wallen. Test drive that puppy and compare, compare. Some machines are like moving a moose, some like herding cats. You want the movement to be smooth without any forceful pushing on your part. I have heard good things about the Innova although I have never personally tried one. I did push around a HQ at my Bernina dealer and it seemed stiff to me, but I am used to a professional machine that moves like it is on glass.
Be careful in your decision, buyer's remorse is such a painful process. Find out why this person is selling her machine, don't jump on it. Once you have it, PPP (practice practice practice) and good luck with your decisions! It will take about a year to really relax and have fun, but once you get there, it is a real TRIP! Blessings to you and may our precious Lord guide you in your quest.