I don't live in the States, but I do know Cingular pretty well. Really, if you want that many features, then Moto RAZR OR KRZR is the way to go but I highly not recommend Motorola. I might be offending many users here, but I can tell you Motorola is the worst cell phone company there is. Unless you don't want to show off your phone to your friends and not mind changing the phone for a year, then go ahed get the Motorola. Beware though, it is really fragile and battery life is horrible after three months. Especially with the MP3-able ones.
Now if want 3G, there aren't many choices either. I don't find 3G too useful since I don't surf the web on my phone nor do a lot of Video Calling. Now if 3G is not needed, which I don't think it is really, I highly recommend any Sony Ericsson phone (like with Walkman, etc.). I'm actually quite surprised that none of the US carriers have K800i or K790. One of the best phones out there (though the newer K810i is better).
Nokia phones... mmmm... they're alright. Depends which ones. The newer ones with update Symbian (phone OS) is much better. Ones can include 5300 Xpress Music by TMobile.
LG phones... okay too. Not the best choice.
As I said earlier, Sony Ericsson phones are the way to go. I have a Z610i, the best phone out there XD! I dropped mine in the snow for fiveteen minutes with skis running on it. There were little scratches and the phone was still working as usual. My older T610i was with me for three years and the battery is still good. But if you are a power user (as in types or edits documents on your phone), Sony Ericsson is not the way to go.
Your choice, figure out a phone company (not operator) before you choose the phone. That's what I do.
First, a little correction - the Nokia 5300 is not a Symbian phone, instead, it uses the Series 40 platform. Trust me, I'm using it now. My previous phone was the Motorola SLVR - the only good thing about it was the design. Everything else sucked big time. My suggestion - go with Nokia - they're very durable, my fell from the third floor and only has some scratches, the firmware is good and the battery life is decent. And by the way, in my country (Bulgaria) kids get their first phones when they're about 10. Just saying