Bryan. Welcome to the Forum. Great that you are thinking about a Rohrbaugh. Just me, but I would recommend the Robar over the Stealth.
The Robar coating, to me, is worth the extra bucks; easier to clean, coating is extra, extra hard, internals are coated. Another way to go, is buy a regular R9s and have Robar coat it; save some dollars.
It's all in what you want. The Stealth is nice, but coating not as durable, in my opinion. Good luck in your decision, and again, welcome.
If you order a Robar, it comes with the extreme grips.