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Here is my favorite (short) list of mods which are "inexpensive" but effective. I know you've asked about powr mods, but I'm adding in other stuff too just for the heck of it 
Power: GS-T muffler (cheap pay no more than $50 used, looks good, fits perfectly), Cold air intake (by used one, they're out there and it's just a tube so who cares, or make your own), AFX pulley (as suggested above, very nice for the price) these three mods will add a fair amount of power, cost no more than $400, and keep you busy for a little bit. That will give you time to decide on whether there will be a turbo in the future or not, that's why I don't suggest a header, it's useless with a turbo setup and the cost for power isn't as good as these three mods.
Handling: Shocks/rear sway bar from a GS-T (they're better that what's on the car now, and you can get them cheap), RX-7 rims (they are wide, light, cheap (less than $500 for all 4), and look pretty good, can't go wrong here). Put the stock 205/55r16s back on the rims if you have them, the wider rim alone will help the handling alot.
Brakes: Upgrade fronts to GSX setup (should be fairly cheap since you can get the parts used, but only useable with 16 inch or wider rims) or new powerslots/powerstop (whichever you prefer), not really budget but good for the price if you don't want to change anything else. But you're going to have to shell out $$$ for good brake pads, the softer the better. They won't last long but they'll stop the car better and that's what matters the most.
hope that helps
Todd Scungio 98 RS 15.803 @ 86.48 MPH
"Tutto fa brodo."
Todd Scungio 98 RS 15.173 @ 90.70 MPH
And also a 2011 Ralliart
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