Is this ur first time riding a bike ?! I suggest u go for 200-400cc bikes. The power is okay u can control and manage it well. 600cc would hv more power, u should be an expert rider to ride one. But if u hv already ridden 400cc bikes then u go for 600cc. Hope u get what I said rest it's upto u.

I would not recommend the rs660 they are still working on alot of issues they have, I'd recommend cfmoto450ss they are amazing starter bikes

It can be done. I’m basically a new rider again and got a ninja 650 last year. However. I have heard Aprillia aren’t reliable machines. So take that for what you will.

Meh....maybe?

That wouldn’t be a bad idea, it’s a faster bike, parallel twin, might feel a little fast. But as long as you respect the power and allow yourself time to adjust, it should be just fine. Def get the extrema😮‍💨