Which is basically a ST205 floorpan, running gear and engine with a Gen 7 body!
The ST205 is an evolution of the ST185. It is lighter, has a much stronger engine, better suspension setup, bigger brakes by quite some margin etc. I am sure a ST185 could be made to be similar but without going on a diet it is always going to be heavier.
As for looks the Gen 6 has the better rear end and the Gen 5 has the better front end. Although the Gen 6 edges it with its comical spoiler!
Needless to say which ever you want to have both options are better than a Gen 7! Real rally bred hero's!