I've always liked the GNs. Owning one is on my "Buick" bucket list. Not sure how many on the bucket list will get purchased, it's fairly long.
A friend at work has a GN that he's put a lot of money into. I believe it is in the 700 HP range, but he pushed a head gasket and it has sat ever since. Then he kept buying more stuff to not work on. I'd like to see it finished, the car will likely fly.