Ask HN: Where to incorporate as a Canadian expat?

I'm a Canadian, currently in America. I'm trying to decide where to incorporate, either federally in Canada, provincially, or in an American state (or oversees I guess). Besides the standard tax concerns, my other concern is I'm not actually in Canada these days, and most of my banking is to be done in USD anyways. Does anyone have any experience with opening American bank/merchant accounts as a Canadian company?