Glad you had her checked out first. AT least you know you don't need those standard upgrades...
Opinions on exhaust are like a-holes, everyone's got one. That may be your biggest problem: Trying to pick an exhaust system that your hubby likes just as much as you (or whoever recommended it to you).
The system has three basic components, headers, mid-pipe and cat-back. Headers are the collector "tubes" mounted to the engine (where the exhaust first leaves). There are several forms of headers, and many manufacturers. The mid-pipe, is where your cat. converters are, if you have any at all. Again, many choices: Cats/Catless, X pipe, H-pipe -- there's about a million threads on these topics alone. Finally, there's the "cat-back" (i.e., from the cat. converters, back). Probably more options here than anywhere else, as there are many manufacturers of cat-backs, each one with its own distinct differences (some manufacturers have sub-choices, such as muffler type, as well).
He needs a new exhaust system, definitely. I'd write him a check for about $1500 and put "peformance exhaust system" on the memo line and give him a big "hug." He'll get what he wants, and save you a ****-load of hassle... Everything from that point on will be easy because he'll let you know what he wants around b-day, Christmas, etc.