Unless there's a reason for being dead set on a Mondeo, I'd suggest a mk6 escort with the 115ps Zetec-E. It's the best basis for a cheap Zetec Turbo by robbing the Ford parts bin (and a couple of bits from Nissan's too). Also, done subtly, but well, a 3dr would look like the Series 3 RST that they never built.

Probably more plentiful than early Mondeos too.