HTC One S or HTC One X
The decision is pretty hard. I love the design of HTC One X though HTC One S seems to be a more sensible buy as it would be cheaper. (I am in India and these devices are likely to launch in the first week of April here).
Camera sensors are same in both the devices I believe. Also read that the dual core processor on One S is a newer generation tech that makes it almost as fast as the quad core on One X.