I recommend the Dell M70 or M90. The M70 is still what I would call a "portable" system. The M90 is the traditional I really want a big honkin huge desktop, but make it flat and call it a laptop unit.
I really like my M70. My M90 obviously performs better (core duo of course), but it's just too big IMHO (the M90 actually belongs to my daughter).
My M70 plays UT2004 just fine at 1920x1200.