Definitively go air suspension - any savings on getting coils will as you mentioned be offset by getting a coiler brought up to scratch and then you will not have the advantage of lower height on the highway and higher height offroad.
There is really no extra costs in maintaining the air suspension over the coils with the exception you may or may not have to take into account the cost of a compressor every 100,000km or so - these can be expensive if bought through dealers or cheap if bought through other sources - down to $500 in some cases.  This cost can be reduced by regularly replacing the dessicant.
Definitely go the air suspension.
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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