I will say this to sway your decision...
The only vehicle I have ever owned that I like better than my 04 WS6 GP was my 99 Vette Converty, but heck that is not even the same sport.
But I would not give up my GP for any other car that I have owned. Including my Avalanche (which I liked a LOT a whole LOT).
Take it for the 24hour test drive.
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S's? Oh it has SS's!!!