Good to see you are ready to make serious power!
Check my sig... im in the same game as you are... Dont get me wrong with the serious power comment... honda/acuras can be made "quick" relatively cheaply and get good gas mileage... but I have yet to see a civic be any match for a Supra, unless it was bone stock from a stop or NA. Go with the Supra, it will hold its resale value the best and will most likely become a classic collector car in the next 20 or so years