If you are looking for an "open detailed sound" stay away from the AP Tempo III. Furthermore, having heard the Vandy 2ces and the AP Tempo III I would say that the Vandy, while similar in opacity, is a bit better.
I have not heard the Coincident Partial Eclipse but I have heard other models in their lineup. The characteristic sound is lively, detailed and more upfront than the Vandy. Also, some of their models are quite efficient and can be run with SETs if you should decide to go in that direction.
Another possiblity is, as the above posts suggest, the Silverline Sonatina.