You're going to pay a bit amount over spot price for metals. So anything you buy is likely a loss from the start, then you're going to be watching currency and futures risks. Gold can easily rise and crash a few percent in a matter of minutes.
due note that full american eagles are US face of $50, if you're planning to sit on the coins for investment purposes, the best bet is likely buying futures or etf/etns that relate to the pricing.