I'm currently most interested in Morpheus, primarily from the perspective of potential cost and comfort. I already own the things that will be needed for Morpheus (camera, Move) so unless the cost is surprisingly ridiculous, it'll probably be the cheapest and easiest solution. Additionally, from all the impressions between all the headsets, it seems like Morpheus is the most ergonomic and comfortable and works especially well with those with glasses (thanks to the way it is designed to sit on your head), which is something that is super important to me. The fact that Sony is taking VR so seriously is exciting to me, especially in the console space. I'm not terribly worried about if the PS4 has enough power to provide good VR experiences or not, because I'm confident that developers understand that and will make the necessary moves to ensure the experience of VR on the PS4 is still as immersive and incredible as that of stuff on the PC. I think there is going to be incredible stuff on the PS4.
That said, I'm not a fanboy of either platform so I enjoy games on both my PC and my consoles equally and frequently swap between them, so I'm also interested in something for the PC. Hard to say which I'd pick out of the Vive or the Rift at this point. I will buy one. Just don't know which right now. To hard to call... comfort is going to be a big thing for me in addition to cost.