Since you know what brand you want, just shop around. I usually buy open box deals myself and in many cases its from crutchfeld as they include adapters and mounting hardware for free.
Otherwise I look for 2 things on new speakers. frequency response the lower the better for range of sound. They I look at sensitivity. The higher the louder they will sound. THe lower it is the more power you will need for the bass to engage.
I use to be a jensen and kenwood fan til I got a set of kickers. Now I have no problem paying 50 bucks a speaker.