As said, ditch the 6x9s they're a waste of money, and are generally just a target for thieves. If at a later date you do decide you want a bit of rear fill (most people dont), then you could run a cheap set of components of the HU. I would get a decent HU, decent front Comps and a sub. Then amp them all up with either a 4 channel amp or two amps (one for comps and one for sub). If you give a rough idea of your budget someone could reccommend some stuff.