Yes, you should tell us what you are going to use it and where.
The 15 in is slightly bigger then the 14.1, so if you are looking for portability I would go for the 14 like I did.
And as stated above, get XP Pro.
My old T-41 had a 64 mb, but was a little chopping with newer games (warrior within, chaos theory), but once you drop the resolution it runs fine.
My 125 mb video plays all games smoothly on high resolution.