Sweet-Mother-Of-What-Ever-is-Holy-to-you!! Excellent guide! Yes, usually i go for 2-phase upgrade path myself. Depending which is the bottleneck.

For my case, GPU>Ram=CPU>HDD... etc etc. So far, my Q9650 coupled with 5870 1GB /4GB Ram still runs strong for the past 1+ year. Runs everything high cept AAx2/AFx2 most of the games i played. Never needed anything higher coz i don't see the difference sand maintain a healthy 50-60 fps v-sync on.

Anyway. excellent work! deserve a sticky for reference.