owwwwwww. . . Kappas at 175W. . . im shocked you arent burning your passives. . . but even so, Kappas were always too bright for me, especially under more power, the metal domes are too bright and the various cone materials used through the generations has always been too soft on the midbass to back it up. . . oh well, now im just ranting, but I do seem to like the reference over the Kappa line
Thanks everyone, I will be powering with a small amp, not sure what kind yet but it will not be junk, either RF, JL Audio, or Hifonics, probably around 80-100x2. My musical taste is broad, Alt Rock, Hip Hop, and Trance. I had Kappas in my old Civic and they were too bright for me just as a reference. My dad had Polk EX's in his car (lower end Polks) and they were OK but not amazing.
if youre willing to spend a little more id say Focal Access, a much flatter response than Kappas, and for not too much more money. . . I agree on the Kappas being too bright, as you can see in my last post
While all of the above will run off of 100W RMS, having more amplifier than you need is never a bad thing (especially if you like to listen at high volumes).
On the other hand, if you're not looking to put much effort into the install & just want something cheap & easy that works, Get a set of Phoenix Gold RSd65cs (the speakers Taco recommended in his post), or Polk DB6501 and call it a day.
The CDT drivers are rebadged Vifa units. Not that they aren't nice, but you are really paying for the CDT passives. Unless you are a huge fan of the CDT passives - If you like the Vifa drivers, you can purchase them directly as such for less.
Vifa's parent company is known as "Tymphany". They are Danish, and produce the Scanspeak, Vifa, and Peerless lines.
I ended up going with Memphis M Series 6.5's with Memphis 2.50 amp to power them, best decision i've ever made, these blow the doors off the stock speakers, sound much fuller than my old Kappas and are at least as good sounding as my Boston Pro's that were in my last car. I got the Speakers, Amp, wiring, sound dampening, and install for $500.00 total which I'm pretty happy with.