I concur that you can have fun with 70bhp, especially if it handles well like the ER-6 bikes DaveH mentioned, or the wee Huskvarna Vitpilen I had on the memorial run last year, or even on my CB750 that doesn't have the best handling but overall it's good enough to keep up. If I could only have one bike, I'd want a bit more power - 100bhp at least.
My R1 has plenty of power but still about 50bhp less than current superbikes. But I can't even use that on the roads here without getting fines galore.
Personally, my balance would be to go for something with looks I love and enough power (>100bhp) to not feel frustrated. I'd want it to be a bike that always makes me turn and take another look at it every time I walk away from it. So a Z900RS would tick those boxes for me.
My R1 has plenty of power but still about 50bhp less than current superbikes. But I can't even use that on the roads here without getting fines galore.
Personally, my balance would be to go for something with looks I love and enough power (>100bhp) to not feel frustrated. I'd want it to be a bike that always makes me turn and take another look at it every time I walk away from it. So a Z900RS would tick those boxes for me.