Wow. Thanks. I see that Morel also has some 3.5's that'll handle 120 watts , for a paltry $900

They'll need some modifications to the standard mounting configuration but I'll bet that they sound nice.
When I dealt with 3.5's it was 10 years ago and the best available were Boston Acoustics FE3's, good for about 40 watts. I killed a few of them with just the head unit. OEM installs have power limit and hipass built into the factory systems to keep folks from hurting them.
Given that the OP is using Kicker's, I stand by my original suggestion of only amping his 6X9's.
BTW, what did those puppies cost?