Apple iPhone 4S (32GB - black, AT&T)

Pros: Retina display
Smoothest OS out there
iMessage is great
Speed
Best camera a cell phone, hands down

Cons: Siri is not as intuitive as they will have you believe

Summary: My first iPhone and smartphone was the iPhone 4 on AT&T when ist first came out. I loved the thing. Everything just worked. And smoothly. After about 8 months, I got lured into Sprint by the EVO 4G. I loved the EVO when I first got it for the bigger screen and customization. But, after some time with it, I quickly realized that while it may be better in some ways, I missed my iPhone dearly. I happily paid the ETF and switched back to AT&T for the iPhone 4S on launch day. I couldn't be happier. From the excellent battery life to the great picture quality, this phone is just amazing. Siri may be lacking in some areas, but it's still in beta and not the reason why I bought the phone. If you're still on the fence between Android and iOS, I'll just say that you'll never have a smoother experience than with this iPhone. Well, until the iPhone 5, I'm sure. ;)