Thanks everyone for all the great feedback. As most of you said, it's all about what you want to shoot, and where you'll be going.

I've narrowed it down to:
Camera body, 7D
3xBatteries and charger
8-16 Ultra Wide Angle zoom
24-105 zoom (Purchased for this trip)
2x16G CF cards plus I've just ordered a 128G CF card. This should be good for at least 3000 images. Saves me having to pack the laptop and external HDD.
Lenspen
Blower
Lens wipes
Lens cloth
Cary Bag

All up just over 4Kg.

Gear_0001.jpg