well the only real way to reach 250hp with the zetec is to turbo it. the downside to a turbo is that your gas mileage drops (not what your looking for). the second downside to turboing the zetec is that nobody makes a kit for the contour and you have to do it all yourself or pay a shop about 5k-6k. if your looking for more power at a better price Hector (EVOLUTIONVIII i believe) put a supercharger on his ATX zetec awhile back. he can help you with that. im sure hell chim in eventually.
when adding boost nothing is affordable for a college student (trust me im in the process and its on hold right now)