I'm in the Death Business
I would still keep them. Just run a good 4 channel amp for all of your speakers and run a seperate one for your sub, you'll see better power from that. I like my JL 300/4 for my speakers and the JL 500/1 for my W7. For 6x9's just go listen to a bunch of different ones, there are tons out there: Alpine, RF, Pioneer, Sony, etc. The nice thing about 6x9's is that they'll still put some power out to fill the back of the car w/ sound while your 6.5 components fill up the front seats. Then let your sub take care of the bass entirely, that'll help your speakers last longer.