I'm in the process of doing the same, I got a dual battery kit at the 4WD show when in Melbourne.  For batteries I'm replacing the N70ZZ that I presently have under the seat with 2 CAT 825CCA Starting/100Ah Deep Cycle dual-purpose batteries.  These will fit under the passenger seat along with the battery kit.  I will run the winch off the main battery and the radio, accessories, fridge etc of the aux.
You can argue all you like about the choice of batteries, but they are reasonably priced (1/3 of an Orbital) and come with a 5 year warranty, they are also maintenance free and sealed so less chance of a leak.
				
			 
			
		 
			
				
			
			
				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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