Lots of the mentioned cars are so difficult to compare because they all excel in the field they were designed to compete!
NGH is a great show car, EXPLICIT was a fantastic track car(although it did look mint as well), Gareth's ran a 10 and WRXRW is... well... its hardly a Subaru at all anymore...
Personally, I would think that "Perth's Best Subaru" would be something that can compete in all arena's, and I would say that Jme's wagon would take that crown at the moment... although thats probably only because WRXRW hasn't been started in 18 months +!
