I have an LS now, and the stockers suck. I want some real nice component speakers but I'm not sure on what to get. Not that interested in rattling the whole street...just good quality. (and a decent price maybe

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First off, what are the speaker sizes? Looks like 6 1/2 in the front, and what, 6 x 4 in the rear? Can 6 x 9's be installed there without a hitch? (I want good tweeters too if anyone cares)
Thanks for any info.