I have a Toshiba Portege M400 which works fine with ZB3.1 even though it only has onboard intel graphics. I’ve had it for 2 years and have had no problems. The latest spec is the M700 which has core2duo and a slightly lower screen rez.
I went for this one because it is 14" (therefore portable), can use wacom drivers direct with pressure sensitivity (not as good as a cintiq but not really noticeable IMHO), with the extra battery pack it will do about 8hrs on one charge. It also comes with integral DVD/CD largish HDD plus loads of ports etc for connectivity.
The native screen rez is 1200x1024 (I think - don’t have it in front of me right now) which at the time was a lot higher and better contrast than the Lenovo, HP etc competition. The only downside is lack of NVidia card for more serious gaming, and perhaps too much bloatware initially (but this is easily cleared off).
I also use it for CAD, 3D Studio Max (definitely need a 3 button wheel mouse for these though), Painter and photoshop (best on a external monitor for colour calibration etc).