I know little about Bowtech specifically, but Greg/Mo and DaveC are quite knowledgeable of them. Greg wouldn't lead you astray.

I do know about buying bows, though. First things first.....Set your price limit and stick to it. If all you've got to spend is $500, then that's all you got. Now, if $700 isn't an issue, the best thing to do is just what you said you were going to do. Shoot them all and decide which one you want. Having knowledge of the bows you are looking at is good, you can ask questions and such, but don't decide what you want before you walk in the door. The Diamond might suit you better, or the Liberty, Allegiance, whatever.