Me, I'm thinking about trying these mufflers I heard about that are supposedly in use in Oakland, Ca. Exhaust blows through the thing and it sounds a loud musical note or something -- no kidding about this either.
The "what muffler?" post seems to come up, in one form or another, like once a week here :) Will save you the trouble of searching (although you'd probably get a better view of opinions if you did) --
A lot of people here seem to go with Banks, Borla or Gibson mufflers or cat-backs, if they want after-market. Heard Gibson is probably quietest, Borla pricey (heck, they all are) and a little louder, Banks...dunno. Think all are stainless steel. Borla at least doesn't sound like one of those "Big-Mouth"- on-a-Civic deals...just sounds like an AMC 4 that breathes a little better.