I got the headers for $350 shipped on ssautochrome.com and I got the cat-back for....well lol, $570 from slp, a bit pricey but i wouldn't trade it for the world.
I'll ask him if I see him again.
Check out my vid and skip to about 3:05 sec to hear the exhaust. Mind you this was before I got headers, so it's a bit raspy, but the idle is smooth as silk.
http://www.youtube.com/watch?v=aCVYeVVN5y0