hi. i have the cpu in my sig (athlon II x 4 630 @ 3.5Ghz). i am thinking that my cpu is the last thing that could be upgraded? i was thinking the six core cpu but im not sure which one, or if i should even bother. i mainly am looking at getting this pc squared away for at least 4 years before having to sell or upgrading parts again. any and all suggestions are very welcome, or any other critiques and changes would be nice as well. thanks