iTunes gift card redemption

You need to set up a separate Belgium-based iTunes (the store) account. Just switch country in the iTunes store section of iTunes (the program); it's at the bottom of the page. iTunes (the program) has no trouble being linked to multiple iTunes (the store) accounts on the same computer. Your current account appears on the upper right under the "search store"box. Once you've bought your stuff in the Belgian store, just sign out and sign back in to your US-based account and Bob's your uncle.