Pacioretty over Kreider in my opinion. He has to find a way into the top 4 lines, he played very well last season and there's no reason to assume he'll decline. Other than that, looks good. Maybe put Parise/Kesler on different lines to balance things out, but you already said you wanted to go for an offense only line so. I'd also put Pominville on the third over Brown. The states look like they're going to have a very strong team.
IMO this would be by far the most talented team the US has ever sent to the Olympics
Hard to beat the 1998 squad in terms of talent. That edition was basically the who's who of American hockey. The goaltending and maybe the lack of prime, nasty physical shutdown pieces hurts them in this comparison though. Your projected 3rd line just look absolutely nasty to play against.