Suggestions for Mobile Workstation Laptop

[artdutra04]

Long story short, the screen on my old laptop died yesterday, so now I'm looking for a new laptop. Basically I'm looking for an engineering/business laptop for light to moderate CAD use, presentations, and other 9-to-5 work. Specs that I've been looking for:

At least 2.4 Ghz Core 2 Duo
Must support up to at least 4GB RAM, but can come with less
NVIDIA Quadro or ATI FireGL workstation GPU, minimum 256 Mb
WSXGA/WXGA+ (1440x900) or higher screen resolution
Hard drive should be at least 120 Gb, 7200 rpm
DVD+/-RW drive
Minimum 3 USB ports, 1 Firewire and/or eSATA port
WiFi card with b/g/n support

Right now I'm looking at Dell M2400, M4400 and Lenovo W500, T500, although I'm leaning towards the M4400 due to the inclusion of a middle mouse button on touchpad (any SolidWorks user worth their salt would appreciate that!). Any input on these or similar laptops would be much appreciated!