no it actually depends what your doing, if its stuff that only uses 1 processor get teh single,
dual 1.2 ghz vs single 1.467 ghz? hmm
a dual 1.25 ghz is equal to a single 1.5 ghz so a dual 1.2 ghz is equal to a 1.44 ghz g4, tough choice, if your playing games id go with the single, cause many game in the future will require above 1.2 ghz, and a dual 1.2 ghz wont change a thign for system requirments, other wise go for the double