What he said.
Go with EMS. No fee/tax. Will still go through customs, but no tax will be applied. If you look on the customs web site, I think there is a minimum value of $400 before taxes will be applied, but for some reason this never seems to be the case when importing through EMS. EMS will hand off to USPS after customs.
FedEx and UPS will always tax you and not at receipt. You will get a bill later. You will be paying not only import tax, but also a brokerage fee to the shipping company. MAybe you save a day in customs this way, but in my experience stuff gets to me fast from Japan. Usually less than 1 week which is much faster than orders from amazon that come from Kentucky.