Well, here is where we all begin to vary in opinion and advice. Some of what I've read above I can easily dispute or give proof of other results. It just all seems to depend on more factors than we can easily accumulate and be able to compare apples to apples. I would agree however, the stock turbo will take you plenty far. I ran 11.90's @ 17-18psi with mine in Houston, but had other upgrades to compliment it. However, I did my own headwork, which in size was minimal at best. I had 36# injectors and a BGC stretch stock location intercooler. If you want the whole list, you can shoot me an email. My point is; you've done the first most important thing by upgrading the fuel system. Now that you've got the pump, I would look for a good used set of 36# injectors. They're readily available on Turbo-Trader for very reasonable prices. I would also suggest putting a shift kit in the tranny to prolong its life! That's another cheap upgrade. I don't know why anyone was suggesting only 15psi of boost. The factory setting is 13, and you've done enough to allow for more than 15psi safely. My street standard setting was usually 17psi, as long as I was not knocking, and I live in a morbidly hot climate. Now, this is where you at the very least need an internal knock detector or some sort of scan tool I highly recommend Direct Scan from John Chu, if you have a laptop to run it on. It's by far the best available. Once you've set your baseline parameters, you don't have to run with it hooked up, unless you're out making more changes. Anyway, I could go on and on here, but this is my initial suggestion list, per your query.
Best wishes...