As much as i would like to agree with you, i just cant. Here's why: So you already have a fox and you want to hang with STi's, GTO's, Evo's, and maybe new cobra's, corvettes. Here's what you would have to do.
Motor: At least 400-500 hp which means either a big inch HCI N/A motor or a smaller HCI + FI motor. Either way the motor combo will cost you at least 5000-7,000 to do it right with all the supporting mods (exhaust, MAF/inj, fuel system, tuning...blah blah blah) it adds up.
Dirvetrain: Good tranny, clutch, driveshaft, shifter, rear end all adds up to at least 2500
Suspension: Full MM grip box plus additional needed parts, not to mention tires and wheels....i cannot even guess a price on this...probably a couple grand at the very least.
Brakes: you all know the deal...2 grand to do it right
Weight reduction/ balance: This means taking a DD type car and making it a purpose built race car to achieve a decent weight balance and drop some pounds.
So right now we are at 10-15k and thats assuming you do all the work yourself and you might have a car thats as fast or faster than the others, and it may handle/stop pretty well. But heres what it doesnt have:
Cup holders, comfy seats, a quiet ride, a nice HVAC system, nice ride quality, traction/stability control, any sort of usefulness in the winter, 25+ highway mpg, stock factory backed reliability/warranty!!!! Emissions legal? probably not....
The real question is how much are you willing to pay to turn the key and be fast...who knows