The bird in our profile pic is a lavender orpington hen. I saw your post out of the corner of my eye and thought I might have some good advice to give. I think the same as what everyone else here has said, Orpingtons are great birds. They are great, because they are big, and not really overactive. That is common in bird types. However, every one has their own unique personality. I have barnevelders that are fair mannered. But I feel my Orust roosters are more mild mannered than the barnevelders, and they are a smaller breed, so size does not always equate to kindness.
If you go to a local farm store, you could probably ask them to keep their eye out for a orpington rooster that gets brought back, and you could get it for free. Or buy a buff orpington cockerel for pretty close to free IFA gets them all the time, I am not sure if you are by there. If you are going to buy an adult bird it is often advised to buy from someone who is NPIP certified, that way you can have a better idea that it won't get your existing flock sick. So it is advisable to do that if you get an adult so you are not rolling your dice with disease. Take note to look up biosecurity measures on introducing new members to your flock. Chickens are pretty hardy animals, but it is easier to play it safe than to worry about containing a problem after the fact.
Tennessee and Utah are a distance away, but we have some roosters we are trying to get rid of. So cost of transportation would be a factor, and they are pricier birds. But we have two types of mature Orpingtons, Isabel and Lavender.
Rooster collars are effective, I know from experience. It takes some time, and it does not silence completely. I would not waste your money buying one, instead just buy about a foot of 1-1 1/2 inch velcro, and follow directions from DIYers online. Just make sure they can breathe. A good rule of thumb is if you can fit your pinky through, it will be good, but I always stay for a while afterwards to make sure they will be alright.