Wow, believe it or not, Nokia has actually released its N85 and N79 with US-friendly 3G stateside. Both are sold without contract, so be prepared to shell out $550 and $400 for N85 and N79, respectively. Prices may vary, though, depending on the retailer.
The N79 is available at Nokia Store, while the N85 can be foung at Amazon. Take your chance.