Firstly, welcome to the board Brad! Glad to have you with us!
We're all a bunch of nuts here, hope you'll enjoy it.
There are a bunch of threads here that cover both removal of the suitcase, as well as resonator removal, and even more covering various complete aftermarket Cat-Back kits. As for the "Performance Exhaust", it actually is, as the front muffler (the suitcase) is a straight-through design. In other words it is not baffled.
If I were you, I would start with removing the suitcase first, instead of the resonators if you are in any way concerned about interior resonant noise. This is the method I coined a name for called the "Brylcreem Exhaust Mod". Check my sig for a link to the thread about it. It's very cheap (most places are less than $60 total bill), boasts a pretty decent boost to the exhaust note under load, and is easy to revert to stock should you choose to.
Resonator removal - If you don't care about interior resonant noise (drone), and want a substantially louder exhaust note, then this is a great way to go. It will cost you either slightly over the Brylcreem method, or potentially alot more, depending on what options you choose. You could replace the resonators with glasspacks or Flowmasters, which will keep the sound pretty subdued, or you could just have some new tips and pipe welded onto the hanging pipe after the resos have been cut off. This will yeild the most noise without going to a fully straight-pipe setup.
Both of these options, or even a modified Brylcreem setup where instead of replacing the suitcase with short pipes you mount a Flowmaster or other muffler(s), are all going to be relatively inexpensive compared to going with a full Cat-Back system.
To be quite honest, the performance gains are going to be pretty close accross the board, as these cars already breathe very well. You might see a slight increased yeild in HP from the resonator delete as they remain the most restrictive devices after the cats.
I'm sure others will post here too and give advice! Good luck with your choice!
Oh, and btw....post some pics!
It's a requirement here