Are you wanting full range in the lowers or just wanting to drive a mid-woofer?
Unfortunately (for your wallet

) - you've heard a really good set of speakers (Focal KRC).
In my opinion, I think you'd be blown away by the following combo's (depending on what your budget is):
Focal:
165KR
165KRC (lowers)
JL Audio:
C5-650 (fairing)
TR-650 (lowers)
Hertz:
HSK-165 (fairing)
HCX-165 (lowers)
HAT:
Unity (fairing)
Imagine (lowers)
Emerald Ice on the board has a similar Focal setup and after speaking with him he is very pleased (Alpine amp).
mjb765 on the board has the HAT setup and he is very pleased (Arc125.2 amp)
I would recommend a HAT Unity (fairing) and Clarus (lowers) combo, but the Clarus require about a 1/8" spacer to fit in the lowers due to magnet size. I would PM Emerald Ice and mjb765 and see if they would buy the same setup again. That should give you a great indicator. Also, in the case of JL Audio and others (where applicable) I dropped a "line" or two in order to grab a complimenting speaker in a coax arrangement for the lowers. Dealing with components in the lowers is a hassle (cross-over mounts, tweeter placment, etc.) The exception here is the Focal 165KRC - it's a coax speaker with an external x-over but the x-over is small enough that is can go in the fairing.
I'll send you a PM with my number so we can discuss in greater (excruciating. if needed) detail.