Hi Stephanie,
I remember being in your shoes all too well. The last thing you want to do is rush into a decision that you are unhappy with. There are pros and cons to both Gammill and APQS machines.
You need to create yourself a list of all the features that really matter to you and prioritize them. Then get your hands on each machine and pay attention to those things that matter most to you. Choose the machine that scores highest on your check list.
During my research I felt the most important factors were stitch quality, machine handling and warranty. These were the three things I was looking for when I test drove the machines. Here is a blog post of my results.
http://manquilter.wordpress.com/2010/02/07/my-reasons-for-choosing-an-apqs-longarm-quilting-system-over-all-the-competition/
Good luck with your research and if you have any questions there are loads of us willing to answer your questions.