If I am correct, the plug you mentioned trying was around 1.25" in diameter, right? The product page has 2" listed as the diameter, but that seems to be incorrect.
In any case... If you are looking for a nice silicone plug that is a bit bigger than that and isn't so easily grown out of, try the Fun Factory Boosty or one of the new Tantus plugs, Juice, Neo and Twist. They offer various shapes that will still be pleasurable even after you grow accustomed to the size, and they're very durable.
If you like stainless steel, have money to spare and want a super comfortable plug, the Pure Plugs by Njoy are the way to go. The Large size is very tolerable, and not "large" by many standards. I am a fan of larger plugs of over 2" diameter, but I still use my Pure Plug regularly because of the unique sensations it provides.
I hope this helps!