The celicas were running 14.5's with mods, or in conditions I could get a 7cyl pickup into the 15's The WRX will do it stock. Also the GT-S so far has had nothing that really improved the handling, while the WRX is just starting out. Need I remind you that its starting at Teg Type-R levels?
Then toss in a better tranny, better motor, factory turbo, a hell of alot more room, AWD, etc and the GT-S looks flat stupid at the same price.
My biggest problem with the GT-S is that its price is way out of line. For $24K I'd much rather have a VW GTI VR6 or Integra Type-R. Or heck cut that to $18K and get a golf 1.8T.