In no particular order: Spits, Nikis, and La7's.
Why?
Each will outturn, outclimb, outrun, and outdive my Jug if I get locked up in a fight with them. Besting them at their own game makes me smile ear to ear when I decide to fight their game and not mine.
If I am in the "historical" mood, I love getting it on against 109's and 190's, no matter the model. But then again, one of the first group always comes in and gets involved...........