Hey Tom,
I had my SM Rhino for 8 seasons and it became my favorite jet. With a couple of well placed carbon cloth additions, this was one of the toughest jets I've ever owned. It survived my beatings!

I had a JC Rhino which was a great combo but does fall short on vertical performance. My Rhino was one of the older versions so I'm sure that the newer versions will give you the uphill thrust. Let me know if you'd like additional info on the weak areas that need carbon reinforcement.
Pull the trigger on the F-4, you'll never regret it!