Phone ideas?

I'm looking into trying a new OS. I have an iPhone 5, and have always used iOS but I want to try something new when my contract ends. I'm not a person who uses their phone to its full abilities, if you understand. I don't need a 2GH processor and 3 gb of ram or anything like that. Just a phone thats good for social networking, web browsing, & texting.

This phone can be blackberry, windows phone, or android. There are no budget or carrier limitations in my situation because I might switch carriers. All this phone needs is a..

- Decen't twitter/facebook apps... tumblr would be good too

- A good camera... up to the par with the iPhone 5

- A beautiful OS, with some interesting features that will wow me..

Thanks so much in advance! Leave any suggestions... rumored or leaked phones work too!