Ok... so let me wrap this around my head...

Supercharged vs None
177k vs 211k
Not dented fender vs Dented Fender
Leather seats vs Cloth seats
GTP pkg vs "basic car"

Your only argument is that your getting a 05 over a 99, but your ignoring that with the miles your 99 is worth as much or more than the 05. Just because it is newer doesn't mean its better. Unless you plan to immediately put it in the garage, do a top swap, tranny rebuild, and replace half the other pieces on the car before you drive it... RUN AWAY!!!!