Want to do some car audio upgrades

I am looking to replace the factory speakers in the front doors, and replace the factory sub.

Here is what I am looking at. Either the Boston Acoustics 6 ½ inch S65RC or the Polk Audio 6 ½ DB651. The opening in the door is a 6 ¾ with component speakers, and am going to leave the tweeter in there.

As far as sub’s I am looking at the 8 inch JBL GTO804, or the Polk Audio MM840.

I will also need to find a small in size amp to run the sub.

Any suggestions would be appreciated.