Gitzo make two trekking pole/monopods but they are designed for only very light gear.  I've looked at these and they are very good, but I wouldn't use it with a DSLR body on top with a reasonable lens as they only support 2kg.  They are the only two I have found.
Link: http://www.gitzo.com/product_list/72...otrek_monopods
It would be possible to convert a Gitzo or Manfrotto monopod foot to a trekking base with a little thought.  It is posible to get a spike for them (I have one for mine).  The key to a good monopod is the head and the rigidity.  As for the head the Really Right Stuff MH-01 is about the best or a small ball head like their BH25 or BH30.  The rigidity is the usual problem of too thin a legs.  I won't say too many sections is always an issue as I have just got a 6 section monopod and it is really solid.
As you are going to use this as a walking pole as well, I would look to a quick release lever clamp on the head and also - even though they are at the expensive end - the Gitzo leg system over a clamp system.  The Gitzo twist locks are less prone to collaps.
				
			 
			
		 
			
				
			
			
				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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