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Pentium-M vs Pentium 4 laptop: anyone playing softsynths?

I'm about to pop for a new laptop and USB interface, and want to be able to play Reason synths live with MIDI. A 2.8GHz Pentium 4 is plenty fast but runs hot and has a short battery life (1.5 hrs or so). A 1.7 GHz Pentium M is about as fast for business apps, runs cooler and claims 3-5hr battery.