ur rich man. if i were u, i would save up for the future. why upgrade something that is that good? but if u insist, i will have fun letting u in on the best stuff now.
intel core 2 extreme(quad core ones)
get 2 of the exact same sticks of ram ea1gb for a total pf 4gb with dual channel
and get cooling to overclock the heck out of the core 2extreme. thats wat i dream about...a overclocked core 2 extreme...aaaah...sigh.and were am i gonna get that money...