I got the Borla all stainless steel high performance exhaust a few months ago.
I love it, and it's a good all around compromise as far as sound.
A little more throatier, but you don't don't sound like somebody roaring around in a "riceburner".

It does come alive above 80mph or when you nail it, but nothing too obnoxious.
You also get a little bit of a power increase.
Use the part # in my signature.
They're only available from Toyota dealers in the South East U.S..
I had mine shipped to me to my door for about $723 total price.
It's also as easy as falling off a log to put on.
Takes about an hour, and you don't need a lift.
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2007 Camry SE V6 Titanium Metallic, Produced 08/06 Kentucky, VIN# 4T1BK46K37U5189xx
Borla V6 High Performance Exhaust Toyota PN# 00016-32102
5/29/2007 TSB TC007-07 done - Didn't Fix Flare Problem
7/18/2007 Transaxle and Torque Converter replaced