I have a 50 series on my '95. Basically, a 50 or 40 series is what you'll want on that. The 50 is quieter, but with the same performance. IMO, I think the 50 is plenty loud! And I left on the resonator which makes a HUGE difference. I actually would go quieter if I could. But if you like it loud, a 40 series will do.
I also replaced the pipe from the cat back, 2 1/4 inch. I wouldn't go much bigger at all with a single pipe. A bigger pipe might give you a little more top end vs. a smaller pipe. But the smaller pipe will still give you some top end, but a lot more bottom end, and mid range torque. For me, the power change was very easily noticeable.
Tony