x2 with Edd666999 get rid of Norton and please please please don't get an i5! i5 is basically a crippled i7 and there's absolutely no point getting one for a gamer PC! I have an i7 920 and it can be overclocked very nicely and is more than enough for all games. I'd also get more than 4GB of RAM, I'd say 6GB is the minimum for decent gaming and there really isn't much cost difference.
Second GPU is nice but not essential IMO.