?
Do you want speed, vertical, or a little of both?
I have a 61FX that runs great but is gutless compared to my Rossi-60...
Also, if you can find a YS-60 (2 cy.) that would be perfect!
One of these days I will get a Dago or Voo-doo, and I will go for speed only!
I think a Saito-100 or YS-91 would be great if they are not too heavy up front-
Keep us posted as to what you decide