Better selection is not all that for me... better prices is what I'm looking for. If the iPhone is going to hit Boost then I think they're going to offer better prices on their standing devices I feel. That's usually their modus operandi from what I've seen.
The way it looks, soon USA cellphones are going to go the same route of 90% of the rest of the world. You buy your device, pay full price for it, and you're free to do what you want with it. Go to any carrier. If you have a large sum to put down you get the large, hefty device and if you only want to put down a small amount you go with the basic, feature phone. The USA cellphone business model was not sustainable anyway.