what's great about nokia is they still sell unlocked phones with US 3G.... for cheap prices... so you can keep that cheap AT&T UNLIMITED data plan while all of the carriers are increasing prices and limiting data with the new phones. Even S^1 can do 90% of what anything else can do. If you feel the phone is a little sluggish, just download a custom rom and flash it. It's so easy actually.
If you want to get locked up into high prices with the carriers, maybe you can afford it and you don't care, but I love getting good deals, so I keep watching Nokia.