The new 55cm, 700c Atlantis and the GBW are the two Riv's I most want to try.
The Atlantis improves on my 54 Hunqapillar by having a longer top tube and the front wheel way out there, which I like. I also want to try the longer chainstays and have no idea if I would like them, or not.
The GBW is just a completely different animal and I would have no idea what to expect. I just know I'd love to try it out.