I have rarely (ever?) heard original source material act as a spoiler for an adaptation before. I like the show too, but I think that watching the show would spoil the books. Sure, there is some commitment required for the books, of which mine has failed (only made it through 50% of Storm of Swords), but the payoff seems soooo much sweeter. There was like a hundred page stretch in Clash of Kings where I could not put the freaking book down!