Oh man, I'd go to town with that gift card. I'd get most of PC game the deals listed for Best Buy. Assassin's Creed, Bioshock, Command & Conquer III, Doom 3 and anything else I like that I could fit on what's left over. After that, I'd lock myself in my room and plop myself down in my chair with copious amounts of salty snacks and sugary beverages nearby in a valiant attempt at giving myself pressure sores and kidney stones while I wither away in front of my monitor.