First things first, as I am sure someone who loves BC coilovers will tell me I am wrong. I am just giving you my opinions of such.
When I installed the BC coilovers, the shock was so much shorter then the Oem shock that when I lowered the car the left wheel went right and the right wheel went left. I had to adjust the toe links just to get it to drive. On to the test drive, some of the strut locking nuts were lose and clunking. Easy fix. I adjusted and adjusted and adjusted but still did not feel compliance from the coilovers. Yes they are stiff but I still bottom out on potholes at a high speed, I have the cracked fenders to prove this. So I am running just about five clicks from full hard on the 10/10 spring rates. It handles very well but what it does terribly is rebound. Hit a rough road and you "will" be bouncing like a 64 impala. Are they worth the 900$ yes they are. But just like you, the kw's were just a bit out of reach at the time. But in all fairness, they did what I bought them to do, replace the blown oem shocks and make the car drivable. But it still costed me two slightly cracked fenders and I am all the way up in the front. The rears have zero issue as do all suspension for our cars. The front wheel wells in an nsx as smaller then a starving figure skater and larger wheels just complicate the issue. The kw's are priced high for a reason. They are researched, developed, and tested. Hope this helps. If you still go with BC I recommend removing your front fender liners.
AJ
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This is my car on the same wheel and tire sizes on BC coilovers on the highest perch up front. Fyi, I am on my 3rd front lip which is Oem