I think it's entirely up to the individual to decide if it's worth it to turbo the 'Tour or not. I love high technology engines, and I see turbocharging as being far ahead of supercharging.
If I had the money, I'd probably trade my 'Tour in for a 03 Cobra, but that's just me. If I had enough $$ to get a 03 Cobra, fix the paint on my 'Tour and turbo it, I'd keep it just for laughs. Like I said before, it would make a hell of a sleeper (at the track), and besides, I wouldn't mind getting into autocrossing at all. As it stands, I have neither the time nor the $$ for any of the above, so this is all just a pipe dream for me...