If you consider that the main reason is Vista, it's a "no". However, I foresee a new notebook for me in late 2007
. Right now, my notebook is plenty enough, but I'm going towards 14 or 13", something I can carry easily (which is not the situation with a 15,4").
I don't think you will have relevant problems running Vista on today's (late 2004-2006) computers.edit: aside from the looks, obviously. but you don't empty your pockets only to have a a better looking OS, do you?