I've just gone to a high end Dell Precision M6500 Laptop with 16Gb of Ram and a 1Gb NVIDIA graphcs card, running Windows XP 64 due to the Corporate Geeks not supporting Windows 7 64. I'm running AutoCAD 2011, AutoCAD MEP 2011, Revit MEP 2011 and Navisworks Manage 2011, plus AGI32 for Lighting...