Matt,

I'm planning on something similar, less the powered sub. (I hate subs.. unless its in a home theater set up, but that's just my opinion)

I'd like to buy MB Quart but there's no where to listen to them, and figure out which series is best.

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2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey

SOLD:
1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino