I have the 6-1/2 kappa components, not the perfect's though. the kappa line has a harsher-sounding tweeter than the reference line and the kappa perfect line. they are $174.00 a pair at:
the JBL's and Infinity tweeters have the best flush mounts. If I had the money though, I would have bought the CDT Eurosport 3-way components. I haven't heard better.