What country and what service provider do you intend to use it with? What features are most important to you in a phone? There are a lot of really awesome phones you can get in the $350 range, but we need to know a little more from you to really make suggestions. Later this year the Nokia 6282 is coming out, which looks like a US version of the 6280. The 6282 will include the
GSM 850mhz band that is used in many parts of the US, which the 6280 lacks. Otherwise, I think they are almost the same phone (you should compare the features yourself before you quote me on that

).
Nokia - Phone Features - Nokia 6280 - Phone Models - Phones Nokia 6282 Specs & Features (Phone Scoop)
Edit: For one thing, I see the 6282 has a 1mp camera while the 6280 has 2mp, oh and here's an OLD press release I dug up on google (looks like the release has been delayed, hopefully not for long!):
Nokia - Nokia 6282: High-speed UMTS performance for 3G customers in the Americas - Press Releases - Press - About Nokia