Asus makes a nice 15" and 17" notebook with a x1700 (yes, it does exist, just rare) that can take quite the beating game wise. One of the people I work with has the 17" one and I think he paid just shy of the $2k mark. You can find them on newegg.
EDIT:
Newegg.com - ASUS F3 Series F3JP-AS096C NoteBook Intel Core 2 Duo T7200(2.00GHz) 15.4" Wide XGA+ 1GB DDR2 667 160GB 5400rpm DVD Super Multi ATI Mobility Radeon X1700 - Retail 15" version. I also see a DX 10 Asus with a 2500 mobility if you happen to want that option.