http://www.neptunesys.com/index.php?...d=62&Itemid=40
That is a very handy comparison chart between the different models, in case you haven't seen it yet. It helped me decide.
After I did my comparison, and then my cost analysis for future upgrades and plans, the full Apex was clearly the best choice for me. The Apex Lite would have cost me more in the long run, and the Jr. isn't as expandable.
I've ordered mine. Just waiting for it to arrive.