[GoodThings2Life]

First of all, the HTC Touch HD isn't coming to the US, and it's a GSM device, so it definitely won't come to Sprint unless HTC decides to produce a CDMA version in the future. The only way you'll ever have one in your hands is if you import it, and good luck getting AT&T to support it.

Second, since you bring up the choice of two GSM phones (iPhone and Touch HD), I can assume that you're considering jumping ship from Sprint to AT&T. That's fine, as long as you live in a major city that actually has 3G coverage, otherwise, you're going to HATE the data service (which in my opinion is the only real reason to have a smartphone).

Since you are obviously looking to switch there, why not consider the HTC Fuze on AT&T? It's essentially the Touch Pro on the GSM network, which means you'll get a ton of actual support for it between here and XDA unlike the other two phones. You get the slide out keyboard, relatively small form factor, light weight, sturdy design (seriously the iPhone3G's are pretty flimsy plastic casing), and a lot more useful software and customization options.