I want to do a little dance of yes yes yes, but Sheppard is attractive to me *for* that reason--I watch his face, his reactions, the way he moves in a scene, even where he focuses his attention to get an idea of what's going on in his head, and I love doing that. McKay, while fun to watch, requires nothing of me at all in investment--it's all on the surface. And that makes the two a really awesome contrast.