Tough one there! I'm inclined to go with A too, but with awesome speakers you also need an amplifier. most "awesome" will merely be mediocre speakers on head unit power. However, if you keep the volume down so you don't destroy them you could add an amplifier later. Don't waste a lot of money on rear speakers...they are just for fill and even the best 6x9's don't sound that great. Put the money into the fronts and maybe even leave the stock speakers in the back and get the amplifier and a single 10" sub instead. THat's what I would do.

Just a suggestion, but you may want to tell us how much money you are willing to spend.