I have Infinity Kappa 3-way 6x9's installed in my front doors and 2-way's installed in the rear. They fit the front with no cutting or modifications. The rear requires some minor cutting of the metal door pull bracket. The only drawback is Infinity's hunger for a lot of audio power. I'm driving them with a 200 watt amp. I've been going crazy trying to track down and fix all the new rattles I now have.
Check out Ebay for some good deals on these. I've seen the Kappa 3-way 6x9's go for under $200 a pair new. You need to hear these things. Clean, clean, clean! No muddy midrange like some speakers. With 4 of these in your car, you may not need a subwoofer.