Headers/Exhaust...??????
Anyway most of the time lope is from an upgraded cam being installed not from the exhaust. The exhaust will open the sound up though and make it louder, deeper and more aggressive but will not make it any more choppy.
If money is no object and you want the best go with the GMMG cat back and some good quality Longtubes like QTP and Kooks, some of the best out on the market right now.
Good luck with your future modding, and welcome to the club. Just beware it is very addicting (get bit by the mod bug)
Hooker headers are nice, i have Jet-Hots which are practically the same thing. Middle of the road in price, look into Pacesetters I think they copied hooker's design. The Borla cat back is not worth the money! That is my opinion, but it costs as much as the GMMG and the GMMG is the ONE and ONLY very expensive cat-back that I could EVER imagine spending that kind of money on!
The best advice is to search and search and search, and try to hear them IN PERSON as well if you can because diff people have diff opinions and the speakers on your computer cannot come close to duplicating what it really truly sounds like in person.

