Xeon rules for video and other highCPU load applications.
Buy more ram, I would not use less than 4 gig as a total (use kingston -
www.kingston.com )
I have two dual CPU IBM M-pro's with dual 3.0 Ghz 1mb cache running descret Edit + combustion with a matrox boardset (people rent them from me, I dont use them myself anymore)