I was also going to make the comment about the dual core processors and gaming, but I guess someone beat me to it. That's the entire reason I got my kick@$$ FX-55 processor for gaming as opposed to the x2 4400+.
Also, as a gamer, I would second the notion that a decent set of speakers are a waste of money, simply b/c you never use them. On the other hand, if you want a decent set of speakers for music and everything else, by all means get them. I personally have the Logitech Z-5500's, which I feel are pretty much the best out there, even better than the Klipsch ProMedia 5.1's, which I also tried out. I love my Z-5500's! If you are really going to game, get a decent pair of headphones, in which I also agree with the Sennheiser nod. Just my $.02...