Congratulations on Dorris! Love the name
I haven't heard of the Silent Runner but it looks nice. My Syrian Arthur (RIP) had a large Silent Spinner and a Flying Saucer - both of which he seemed to enjoy. The Flying Saucer is great if you're struggling for height space but it's quite wide and rattled a bit, too. The Spinner's nice and quiet but be aware that it's very tall!
Arthur wasn't much of a wheel pee-er, but my current ham - Bernadette - certainly is