i put a few sets of phoenix gold RSD65cs component sets in a few vehicles.
http://www.ebay.com/itm/PHOENIX-GOLD...item19bedaec66
i like them alot and they got great reviews for an inexpensive speaker. nice and smooth.
i make rings out of plywood or advantek (water resistant osb) or whatever and space them out away from the door about an inch. that helps with depth cause these speakers are built like a subwoofer with a vented, extended pole piece. that way you clear the window and dont have to cut the 5 1/4" hole larger too.
id put another set in the rear... just epoxy/screw a piece of MDF under the rear deck with a 6.5" hole in it.
my friend has a set of MBQuart onyx component in his neon. they are a little bright cause the tweeters are so insane. they are cheaper than the PG's as well.
Brian