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[Mike in CT]

Lots of way to upgrade. Just look at what others have done over the years and decide on your path. As XTREMETUNING mentioned, I do not use any back fill. Only the subwoofer (http://forums.bimmerforums.com/forum/showthread.php?t=1446581#) coming through the ski opening. Using an 8" JL. Fine for the music I listen to, very tight. Presently changing things after a few years. This is what I have right now.

Boston Acoustic tweeters at sail panels.
http://i349.photobucket.com/albums/q390/meenaveen/Audio/Tweeter-1.jpg

BA 4" Pro Speakers (http://forums.bimmerforums.com/forum/showthread.php?t=1446581#) in door location.
http://i349.photobucket.com/albums/q390/meenaveen/Audio/Doorspeaker.jpg
http://i349.photobucket.com/albums/q390/meenaveen/Audio/DoorSpeaker3.jpg

Hybrid Audio L4 in kick Panel.
http://i349.photobucket.com/albums/q390/meenaveen/Audio/Kickpanel1.jpg
http://i349.photobucket.com/albums/q390/meenaveen/Audio/Kickpanel2.jpg


JL 8W3 in ski Pass
http://i349.photobucket.com/albums/q390/meenaveen/Audio/SubInternal.jpg
http://i349.photobucket.com/albums/q390/meenaveen/Audio/SubGrill.jpg

Used existing holes in panel to mount sub woofer enclosure, no drilling.
http://i349.photobucket.com/albums/q390/meenaveen/Audio/SubMounting.jpg