This past summer, I purchased a WS6 and I love this car to death. However, I have been presented with a pretty good deal to trade for an '06 GTO. Now, here are some pros and cons of both cars:

WS6 pros:
-fun to drive
-looks like a true muscle car
-more aftermarket support

cons:
-i feel claustrophobic sitting in it, not much room to move around
-pretty uncomfortable for someone tall such as me
-limited field of vision

GTO pros:
-excellent drivetrain, LS2 > LS1
-very roomy and comfortable interior

cons:
-looks extremely blah, like a grand prix on steriods
-independent rear suspension sucks ass