Great recommendation. The Gear Omega (which is a heavy stainless donut) is great. That only comes in 2 1/8", but for some reason donuts are easier to get on than the flat thicker rings (that come in 2.25). But both feel about the same, except for the weight of the donut, which is about a pound.
You are right. I forgot to mention that donut shaped cockrings are easier to wear than the ordinary, cylidrical ones.
By the way, the Fury cockring from Gear Essentials mimics the effect of having 2 cockrings on. If you gain comfort with just one cockring on and are adventuresome to try another, perhaps the Fury would be the next step. (I don't own it, but i woudl imagine ... )