I have done some research browsing websites and forums and I think I have made my decision.
For the stereo unit:
Eonon D5102 | Car DVD | Specific Car DVD | Car DVD for Mazda 3
I have read a lot of reviews about component speakers and found it to be the best one. I'll run it off the amp on the stereo unit. I do not need an amp/sub.
Amazon.com: Polk Audio DB6501 6.5-Inch 2-Way Component System (Pair, Silver): Car Electronics
I'd appreciate your input on them.