Do you have CSII? Remember that the original speakers were all either 8 or 10 ohm and the CSII fronts are in Parallel. If you connect 4 ohm replacements to the fronts with all of them in parallel you will end up hurting the amp in the stock headunit due to the 2 ohm load. Plus, I think there is a small cap inline to one of those fronts to filter out low frequencies. Common sense would say that it would be the dash speakers, however the schematic I saw showed it running to the door speakers. For aftermarket speakers, I would honestly run separate wiring to them. a 5.25" component set would work out well. Personally I would skip putting the tweeters in the dash and use brackets to mount them to the underside of the dash near the kick panels and angle towards the dome light. If you want to run coaxials in the doors and the dash, you are going to want to run them in series and also bypass the factory wiring. The problem with that is that unless you go with high ohm rear speakers, the rear will overpower the fronts and ruin the front soundstage. Another alternative on the rears would be to get some adapters and run 6.5" or 6X9 free air woofers only back there. Not sure what is available out there that could run on low wattage, but I'm sure there is something.