Bigger displacement is a plus to me. The aftermarket will be about the same for both, the plumbing really wouldn't scare me at all. I'd buy the STi just because the EVO is a mitsubishiti.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15