I'll just post some labtops that are "top of the line".
Dell's XPS are #1 at the moment and in a close second is the Alienware Area 51M. Another company worth taking a look at is Acer. Hope that helps.
But it all depends on how big your budget is.
I would prefer a AMD Athlon XP over Intel's P4s. I'll just list some reasons why.
XPs don't get as hot as P4s do.
XPs don't take as much voltage as P4s.
XPs cost less than P4s
That's just a few reasons why AMD is better than Intel.
Right now, the AMD Athlon 64 FX-53 is the top CPU you can possibly buy, but I hope you have $900 to spare.
As for RAM...It should have at least 512Mb, but preferably 1Gb.
And for the graphics card.....I would go with a ATI Radeon 9600 (at the least)