I still love my Actionbent Tadpole... And cheap was a very good deal (less than you listed). You obviously know your bike stuff so working with an importer shouldn't be an issue. If I were to consider an "upgrade" I wouldn't look anywhere else except Greenspeed, ICE, and maybe Catrike... But it would take a lot of convincing for me to give up my ABTT. If money is no object, look around for an ICE to testdrive.
If you're just trying to figure out if a trike is your type of ride... the ABTT is a good choice as resale on these trikes is 85-90% of new. That's hard to do with any of the higher $ models. So having said that, you probably want to search the used offerings as well.