I too am looking to buy a tadpole (real soon - can't wait...want to make sure I get the right one) and have been researching A LOT. I've gone to Yahoo Groups and checked out all of the different trike brand groups, also this forum, of course, Bike Speak and
http://www.bentrideronline.com/ and just general searchs. I originally was looking at WhizWheels and ActionBent T1X too but have decided to
save some more pennies and wait until I can afford a better trike.
I have narrowed it down to three (I think - still researching) - Catrike Expedition, Trice Q or HP Velotechnik Scorpion although I have not counted out Greenspeed yet. I haven't gone for a test ride (that will make my choice final) because the closest LBS that has trikes is two hours away. Good Luck to you