They're all idiots. You can replace any or all of them and leave the rest alone.
As for replacing the ones in the doors, the large® ones aren't worth upgrading. The top speaker is your tweeter. You can replace that by buying a component setup, or, if you want, you can just replace the the kick panel speakers with coaxials and not worry about what is in the door at all.
Lastly, the most reccomended brand you'll get here is Infinity. Great speakers, and argueably the best for the money.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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