Hi JWBond, if you plan on changing your speakers, remember that there is also a tweeter in the door, you need to remove door trim to replace these (easy task 7 scews, 1 push in style plastic clip). In the meantime fix you rattle.
Front speaker are 2 way (bass and mid range sound) paper style low quality items, plus there is a 1" 5/8 seperate tweeter (voice/hight pitch sound)higher in the door (2 scews the remove it from the door trim)
I'm also in the process off updating my audio system, basicly changing the speakers for better one. One last thing while your there, sound deadening material (Dynamat)help a lot as it minimize vibration cause by the speakers.
Good luck
Stephan
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2000 GTS ACR Blk/Silver Stp
2005 Hemi Ram