The reason you will never see an N-Series phone sold by a carrier in the US is that the market does not exist. The N97 will likely cost well above $1000 when it is released. Even if a carrier subsidized that to, let's say, $500 with a contract. They still couldn't sell it.
Americans want free or extremely cheap phones. That's the bottom line. Carriers simply can't sell handsets for more than $300 on contract in this country.
I h8 txtspk.