Everybody has there own preference as far as the front door panel speakers, but for your rear deck speakers, I get the best quality sound from 3-way 6x9's. I myself have always went with pioneer for there mid & Hi's and havent had any complaints.
I took the spec's from HOTSS web site and had a local car audio shop cut out, mount & intsall the speaker templates and speakers for $60. I'm running 6.5 3-way's in the front and 6x9 3-way's in the rear deck, ALL Pioneer. No amps (yet) but even off the stock Head Unit I still get great sound.
More Stereo system to come..... I have a pair of S10L5's and a Box w/ 1 Cu.Ft. per chamber.
I still need to get my hands on two amps and a Upgrade on the Head Unit.( All of which I have picked out, just need to fill up two more piggy banks, LOL)