Empirically, I'm getting about the same results from my 1 page and my 2 page CV, based on call back rates, funnel progression, and interviewer comments. Go ahead and use two pages if the incremental content is relevant to your overall pitch.

(In my case the extra material is relevant... I've run pricing at five companies, which is usually a massively cross-functional job. Unlike my typical competitor, I've also mastered most of the supporting technical, accounting, and commercial disciplines... which makes me a one stop shop for serious pricing problems.)