Personally, I would go for the 240. Like Stracing said, you could easily drop in a SR20DET and that thing would fly.
None of the other cars on your list really do anything for me. I hate Ford/Lincoln/Mercury, with a few exceptions (GT40, etc., you know the good ones

) But of course its your car, so get what you like.
I dont know too much about the Cougar, the muddy brown anti-freeze doesnt sound too good though. Lets us know what happens when you get it checked out. Good luck bro, happy shopping