Nexus 5!
1080p screen
Very fast
supports 4G
great 8mp camera
you get stock android on it
Although it is $349, I'd say it's totally worth it. I went from an iphone 4s to the nexus and i'll never go back.
With a little research I think you should choose between the HTC One X and the Sony Xperia SP. It really depends on what you will be doing on it, I don't know if you'll use it for calls, texts and web browsing or maybe you want to play games on it and use it for entertainment.
Nexus 5!
1080p screen
Very fast
supports 4G
great 8mp camera
you get stock android on it
Although it is $349, I'd say it's totally worth it. I went from an iphone 4s to the nexus and i'll never go back.