Invicta was Buick's middle of the road or small car when it came out. It was a full-size car, but still smaller than the Electra.Invicta is a full-size nameplate, but since the big car should be called Electra I vote for Invicta. Invicta is better than Skylark and Regal, IMO.
I think Buick needs to rename it's trim levels as well, starting with the Special as a base car, Super as midlevel and Limited as the top of the line.
When they come out with a compact maybe they could call it the Apollo.