Pete, you need to wait, Nikon is bringing out the D4 and it will be a perfect match for your Land Rover D4 
Seriously though the two cameras aren't much different in specs.  Canon's SX models have always been given a good wrap.  I think it would come down to 2 things for me:
* Which feels better to hold and use.
* Which has a faster cycle time between shots and for turning power on.
The Canon G12 is an excellent higher end (and larger) compact and I've had a play with one as well as the Olympus XZ-1 which is also excellent.  For a ruggedised camera the Panasonic model is the pick of them.
Don't forget about the TRS when buying the camera as you can get the GST back on your purchase (over $300) if made within 30 days of traveling overseas.
The best thing you can do though is buy the camera and have a good play with it before leaving.
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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