Flowmasters are popular, but Magnaflows are proven to flow better (at least on the test vehicles). If you might be interested in a Magnaflow muffler you might check www.justmagnaflow.com
and get free shipping on purchases over $50.
In a side by side comparison I have heard a 1993 SLE without a resonator, and 2.5" piping and a 1994 SLE with 2.25" piping and factory resonator. Both cars had a Flowmaster 80 Series (2.5" inlet -dual 2.25" outlets) and the 1993 SLE was a LOT louder.
I had my 1999 SSEi there with a 3" Magnaflow (all stock exhaust before the muffler), and it was quieter than the Flowmasters at idle (could hardly hear my car next to them), but when we revved my Magnaflow gained more db'* from idle to 3k rpms compared to the Flowmasters, but still not quite as loud.
For a muffler you will need a F-body muffler, or on with one outlet on each end.
There are a few sound clips floating around BC that I'm sure you seen/heard in your research here, but if not look at the Exhaust sticky in Performance and Brainstorming.
Also, Dynomax, and Raven are pretty good from what I've heard people say (have a Dynomax Super Turbo on my Lebaron and really like it but that'* a 2.2L turbo engine).