International bidders are great. Usually anyhow, I hate it when they complain about shipping costs when the auction clearly states that it is ACTUAL costs from the post office. I never ever accept money orders b/c I want the money while I'm still young.
For international bidders, I only accept payment elecronically as well such as c2it, paypal, bidpay, billpoint, etc. That is more than enough options.
I've recently sold too many international bidders. Canada, Switzerland, & the Phillipines just to name a few & all of the transactions have gone smoothly.