Your older headers will be fine. Depending on the state you live in, with emissions checks and all, Id say go for a cat delete H pipe. I was always a huge fan of the Flomaster 2 chamber mufflers. Id get 2.5 inch midpipes, Flowmaters, and 2.5 tailpipes.
IF you have an LX make sure to get the chrome tipped units. If a GT, then they are just stainless with a turndown.
You can just change the H Pipe and Mufflers if cost is a concern for you. What headers do you have on the car now?