Here is another good comparison chart between the top phones today:
One thing to keep in mind about the iPhone 5 is that it does NOT support simultaneous voice and data on LTE networks, i.e. Verizon and Sprint. Otherwise the phones are fairly similar from a technical standpoint. A little bigger screen on the Samsung...iOS vs. Android...
I want to take a good look at the Nokia Lumia when it comes out. Also, they are going to release the S4 next March if you can hold out.