Originally Posted by Djembe
Considering you're looking for a widescreen, the V6va is out. I'd go for either the Z71v or the Z70va. They both have high resolution 15.4" displays and are customizable. The Z71v has better sound output from the audio-out/SPDIF port, but the Z70va looks better (aesthetically) and has a better screen. Both have a good battery life and feature Centrino technology.
For most features, Pentium M processors perform at or equal to Pentium 4 processors with 1.7 times the processing speed. So, multiplying a Pentium M processing speed by 1.7 will give the approximate relative Pentium 4 speed that it can duplicate. for instance, a 2 Ghz Pentium M processor will run approximately equivalent to a 3.4 Ghz Pentium 4 processor in most tasks.