Yes, 5x7's all the way around. I use 5x7 components in the front, but they seem harder and more expensive to find these days. You can go with 5.25in components in the front with a special mount or 6.5in components with some modifications to the door.

As far as amps, I just use my Pioneer's internal amp to power mine and a 100watt amp for the sub under the rear seat. For speakers I use JL Audio and Polk Audio.