My Website is based in New Zealand so 99% of my sales will be from here, what i would like is when the user clicks the paypal express button the default country selected is New Zealand (I know thats more a paypal setting but I'm sure you guys will know).

and also how can i be sure what currency paypal is charging someone? I have the default currency on zencart set for NZD, but whats to stop someone from the states leaving it on NZD, going to paypal and paying the NZD amount with their US credit card? Will paypal adjust the rate correctly itself? Am I better off not having multiple currencies set on my site and letting them/paypal figure out the conversion for themselves?