I am hoping to buy a notebook soon, which most likely would be Pentium M. I am just wondering how each version of PM (1.3 ghz, 1.4 ghz, 1.5, 1.6, 1.7 ghz) compare to Mobile Pentium 4 and/or athlon XP mobile. Trying to figure figure out what ghz P-M to get. Also, I guess it would nice if someone could compare its performance to regular desktop processors. Mainly going to be used for office tasks, mathematica, C++ programming, etc; so I am looking for those peformance comparions. Won't be doing on intensive gaming on it, so I don't really need to know about it how it does in gaming at all. I am on a low budget so don't want to get more power than I need.