This article should help to answer some of your questions when comparing the mobile 2500 (overclocked) with the A64 3000+:
http://techreport.com/reviews/2004q1/athlonxp-m-2500/index.x?pg=2
Of course, you won't have the ability to run 64 bit windows when it comes out next month, but if that's not a big deal, then you should go with what you feel comfortable with.
http://techreport.com/reviews/2004q1/athlonxp-m-2500/index.x?pg=2
Of course, you won't have the ability to run 64 bit windows when it comes out next month, but if that's not a big deal, then you should go with what you feel comfortable with.