I highly advise going to some stores and listening to everything you can to pick the speakers. Infinity is the number one choice of someone that reads crutchfield mor ethen they listen to speakerspclemystery said:I was thinking of replacing all the internal speakers in time with something like the Kappa series.
To start with I was looking at adding in some Kappa 6x9's and using the factory kenwood amp for that. Then I wanted to find a solo 12 to put in that doesnt' require an excessive size box.
If you have any thoughts to add please do. I have not been in tune with car audio since my high school days.

Solobarics are not as they once where. Kickers solobarics(L5 and L7) now are built to be in very large ported boxes and are anything but an SQ sub. If you liked the older Solos and want a small box then a JL, Image dynamic, or eclipse.