It really doesnt have to cost that much.  
You dont need a sump but they can be handy.  
you dont need a skimmer but they can be helpful. 
I just set up a 75g cube tank, and I did it for cheap.  
100 bucks for power heads 
90lbs live rock 200 
T5 lights 380 (ok this wasnt to cheap but you need lights for corals. 
 
so $680 for a 75g tank. If you do lots of water changes you dont need a skimmer. But i could still add a skimmer to the tank and the price will still be reasonable. 
		
	
		
		
		
		
			
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				Sean
  
Back in the good ole days   
			 
		
		
		
		
	
		
		
	
	
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