i would NOT recommend pioneer 6x9s. I as well as other members of the forum will tell you, the pioneers are nothing but annoying aluminim dome tweeters. The bass response is lacking to say the least. MY friend has some in his car running off of HU power and all you hear are the high end of vocals and other tweeter sounds.
There are lots of good ones out there. Memphis audio 6x9s are pretty good as well. Imnot sure if kicker makes 6x9s, but if they do i would think they would live up to the kicker quality. Just dont go rockford fosgate, pioneer, or sony.
why 6x9s put sum 6.5 comp in or something make a mdf ring not hard to do just a little mesuring and wham you did it. and youll be so proud of yourself yell tell all your friends and next thing you know youll be hooking up your friends with custom 6.5