Do some searching....there's a LOT of info already out there on these forums. In case you don't feel like searching, I'll get you started with some info:
The reflash is ~$400, but don't quote me on it. Talk to Tom for exact pricing...
The header/cat/exhaust is a pretty decent bottleneck (well, really just the header and cat, but a cat back makes it sound nicer...). The SVT header is (or was the last I looked into it) the best header for your money.
Just keep in mind, that these aren't really N/A beasts. You aren't going to get a LOT of power out of it. Some of the highest N/A numbers I've seen are around 200 whp, and that's with a LOT of work...
Zetec....is that like Vtec or something???
Zetec Crew #103/ATX Faction #27 (retired)