The GTO is a great car, really. Mine is modded up a bit, and it's a hoot. I need to look through my log files and see if any of them have the horsepower/torque numbers recorded in them. I will say it doesn't have the quiet interior of my Grand Prix. The GTO resale has gone down a lot lately, which is why I've not sold mine.
I'm going to be modding my Grand Prix more in the short term. I will not be staying NA, as I'll never get the power output I want. These are nothing like the LS engines, especially the later ones. The 06-08 Grand Prix not being able to be tuned sucked until I bought an 05 VCM to put in my car. There are one or two annoyances, but the car is so much nicer to drive 120 miles a day than the Goat.
