I would enjoy a 05 GT
much more than a blown '04.
The '05 handles much better
The '05's ride is much better
The '05's driver's position is much better
The '05's front seats are much more comfortable
The '05 is much quieter (road noise, etc).
The '05 looks much better. (inside & outside)
The '05 will have better resale value (modifications lower your resale value)
The '05 has a warranty on its drive train (add blower = no warranty)
The '05 has a bigger trunk.
The '05's shifter is in a better position.
The '05 runs on regular gas (with blower on the 04 you need premium)
The '05 GT wins.