Everyone needs 130 HP, come on!
Seriously, having gone from a K100 to a K12GT I know the additional power is not an issue. It does have a throttle, you know.
Next, coming off a K75, a smooth bike, you might fine the R a bit...ummm....different. Before getting my GT I spent some time on the R-RT which I really wanted to like. I loved its riding position and handling but missed my K engine.
You need to spend some time on both K and R bikes to see what really fits your needs and wants. The K12 is a big and heavy bike but oh-so-smooth. The R bike has this funny shake and mild engine (compared to the Big K) but is very sweet to ride and easy to handle.
I love them both but I just can't give up that Big K Kick in the ass.
Good luck, nothing like getting a "new" bike.