Kappa's are a good quality component speaker. I have alway shied away from showing my particular bias for audio hardware because everyone's ear is different, I always tell folks to buy the best quality (warranty, level of manufacture, service) for your budget, if you spend enough time with the stuff you will know what you need aurally when you upgrade...because you always upgrade.
Here is a site I sent to Bill Miller for ideas on installation options for a cab. The porn mullet is an interesting option...
http://www.2phast.com/porsche1/porsche.htm