I think that if you want a decent set up that will give you decent sound, hp, and value would be a ES oval muffler with mandel bending to the cat. There are alot of people on honda-tech with this set up and there are many vids of it, check it out to see if you like the sound.
Also just a cat back will not do much for performance, I recently put the stock air intake back on my car so I could run stock class in AutoX, the performance was significantly reduced. Also, the whole I/h/cat/e thing is all about making your engine breath better because after all, your engine is basicly just a big air pump. If you could inhale better but had no way to get the extra air out, are you going to be able to perform your best? No, and your car is the same way.