nick, do what i did. i went to one of these shops that advertise in the pennysaver. got an amp and the door speakers (half a component set) for 375 including the labor to install. i did the fronts myself and still have to do tthe rears. total outlay

140 (two sets of 5.25 speakers at best buy)
375 (amp and door speakers and labor to install.)
615 total.

after a long time getting the front speakers done i didnt want to go through the same hassles installing the rears especially with cutting. i tried to find 5.25 spacers but most of the audio shops i went to didnt have em. so im going to use some speaker surround (the plastic part that goes around the grill) as spacers, most shops will give em to you. i went to home depot and got about 3 ft of insulation, the type you use around windows and so on. gonna use that above and below the "spacer" to not only filli n the irregular shapes but to insulate as well. dont want any rattles and squeeks.
i just havent had time to do the rears yet.

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bmw 2002.
long live the legend