I wrote a lengthy response to this but it seems to have disappeared.
essentially, I prefer your idea of the single site and a fixed USD and fixed CDN pricing, but it leaves me with some more challenges on marketing, pricing and payments. Our dollar exchange rate is terrible right now and the disparity in pricing and fluctuations would make this challenging
so if we did your method and i changed the site to collect payments in USD, when would the customer see the currency exchange if they are shopping in CDN? at the paypal checkout?
We have customized my store pretty heavy - how difficult would it be to do a duplicate? could i do all the basic work and have you do a premiere ticket to fix up all the connection issues?