I happen to have a Dell Inspiron XPS notebook. You can get one loaded for about $4000 with the extended warranty, additional 16-cell battery pack, and maybe a modular floppy. Probably the only thing it is missing is a 2nd modular bay. It weighs about 10 pounds with the 16-cell battery.
Mine has a P4 3.4 GHz, 512 MB RAM, MR9800, 15.4" 1920x1200, 4x DVD+RW, 60 GB 7200 RPM HD.
It pretty much handles anything I throw at it. The 15.4" LCD is kind of small for the resolution, but it looks really good. I also have a 2001FP which I use as a 2nd display if I want a larger display. I am now using the Omega drivers and have no issues with DVDs or games.
It has 3 cooling fans, so it stays pretty cool considering the speed. Battery life takes a beating, but I have it on AC 90% of the time.
It comes to about $3700 for a P4 3.4 GHz, 1024 MB RAM, MR9800, 15.4" 1920x1200, 8xDVD±RW, 60GB 7200 RPM HD, 4-year at-home service, extra 16-cell battery, wireless b/g, modular floppy drive, WinXP Pro, and XPS back pack ( you will need it

).