yeah, if going to SQ i would spend a lot of that on deadener. I would rather have solid doors and mediocre speakers and amp over good speakers in a non deadened door. SQ starts with the front and works its way back.
if you are willing to start out front, if you do some reading, you will find pretty darn fair prices on a DIY front stage. mach5 6.5s and seas tweets active should not break the bank and will sound great with deadened doors.
Read more than this one thread before you spend your money!
you might even want to head over to
diymobileaudio to read some things... its more of a SQ environment. check classifieds for your purchases.