Thanks for your help fellas.
I've decided to go with the HP8560W with the following (since work is paying for it!):
Windows 7 PRO64,
Intel Core i7-2720QM Processor,
15.6 FHD WVA f/CAM Display,
16GB 1333DDR3 4DM Memory,
750GB 7200RPM Hard Drive,
2Gid NVIDIA Quadro 2000M Graphics Card - Unfortunately, only comes with DDR 3,
BD/DVDRW UB Optical Drive,
and the usual stuff bundled with it.
I believe the weight will be 3Kg, which, considering what it will be packing, is not bad.
There is just one problem - I have to carry it between work and home
I'll have time to put it through it's paces over the Christmas break. Let you know how it went.