nitrag -
this past April i did what you are planning to do, configured my own laptop.
these are my specs :
Athlon64 3000+
1GB pc2700 ddr (2x512mb)
60GB 5,400rpm HDD
Radeon mobility 9600Pro 128mb
DVD/CD-Rw combo
XP Home
15" screen @ 1400 by 1050
PROs: the battery life is great w/ AMD64 CPU's, about
2hrs45mins.
stays far cooler than a P4 3.0gHz> CPU, but i still wouldn't place it on your lap for a long time.
runs windows applications like a breeze.
boots up and shuts down extremely fast!
can play Doom3 AND HalfLife2 on HIgh settings! (keeping it plugged in greatly increases performance)
better than luggin' a whole desktop to LAN parties.
CONs:
8 1/2lbs (9 1/2lbs w/ adapter) you're shoulder will hate you.
unfortunately M$ service pack 2 decreases ALL laptops performance, no way around that.
little internal speakers are awful but makes up for it in it's internal 5.1 surround hookup capibility.
how much?
i priced the (almost) exact same system specs at VoodooPc, Alienware and Dell's XPS and they all wanted at least $2,900.
i got mine from iBuypower for $1,700 back in April, it was really well worth it to pick out what you wanted.
i would seriously consider looking at the Radeon 9800 mobility VPU's out now or get a Radeon 9700 VPU a little cheaper. i also hear good things coming from the nVidia line.
what else can i say, this laptop does everything i've wanted and more. it's awesome!
good luck w/ your build!