I do my own vehicle maintenance so I'll give you my prospective - I imagine it would be different if you where paying someone else to do most of the work. I've also not had my disco for very long: 
Parts prices I haven't found to be too bad, certainly no more expensive than any other similar aged vehicles. In saying that there are a few expensive(for what they are) components. Getting parts is fine for me, any major bits I just order from the UK where they are plentiful and cheaper than here. As long as what every your doing is planned that's fine.
I run a TDV6 and the engine oil is more expensive (synthetic oil)than what Im used to, but there's only half as much compared to most Japanese diesels and the services are a little longer.
Auto oil is expensive, but its good quality synthetic and would be on par with most modern auto fluids. 
Timing belts are on the more expensive side, but much longer service intervals than any Japanese car so its offset somewhat there. 
I've had one drama with a front airbag leaking so replaced both front strut assemblies complete and new front wheel bearings as well. So far I haven't had any other dramas. I know front lower control arm bushes flog out quickly (compared to a Japanese 4wd), but you can get complete replacement arms cheap enough to do the job quickly.
				
			 
			
		 
			
				
			
			
				Shane
2005 D3 TDV6 loaded to the brim with 4 kids!
http://www.aulro.com/afvb/members-rides/220914-too-many-defender-write-ups-here-time-d3.html
			
			
		 
	
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