I don't have personal experience with the Cusco coilovers, but they have a reputation for being stiff/harsh.  In general, most everything out of Japan is pretty harsh, ostensibly because they have really smooth roads there.  I think sybir has run the Cuscos on his wagon in the past... perhaps he can comment. 
 
The KW's would probably be a much better fit for you if you plan to drive the car on the street a lot.  MattR ran the KW V3's (?) very successfully for years at autocross, so they're also pretty competitive while being more streetable than the JDM bits.
		 
		
		
		
		
		
		
			
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