I wouldn't wait on
@Formidilosus to jump in. If you read through his posts, you will find he is a fan of the Hyperion K and the OG (which you already have). He has also made the same points that others have made in this thread (i.e. suppressor volume is a big factor). As far as tone goes, that is an individual perception that requires you to actually hear each of them being shot with various cartridges to determine what you like. No amount of forum talk will be able to tell you what tones your ears/brain interpret as "the best". I think all the cans on your list are good for what you plan to do with them. I would add the Hyperion K to the list. It is in the same size/weight range as the rest and it is in stock at Silencer Shop.
All that being said, in your poll I chose the Nomad Ti XC. I have a regular Nomad and it is one of my go-to cans even though it is 4 ounces heavier than some of my others. It has very good suppression and its tone works for what I shoot it with. I have shot the Ti XC version on a 6.5 Creed and a 300 PRC and it did very well. It was a tiny bit more "tinny" than my regular Nomad, but that is to be expected based on construction materials used. The ABs work very well too. A good friend of mine has both the 8 and the 10 and uses them on a variety of rifles including 6.5 Grendel, 6.5PRC, 7RM, and 308. While I have not personally heard the long version of the Diligent, I have shot the short version (7-08 was the cartridge) and it was pretty good as well. I would expect the Long to be even better. I haven't shot the OG, but you already own one of those and I have read your initial impressions on it. The TBAC is a very good can. My only issue with them is that the DT option is just a muzzle device rocksetted into the can. It doesn't add a ton of extra weight and I believe that they are HUB compatable so you could replace the mount system with a Ti DT HUB mount, but it is still a sticking point for me. They do sound good though, especially with "midsize" cartridges (308 family and such). As far as the Scythe goes, I beileve I read that you already own one of these as well and I really don't need to get into further discussion about some of the issues they have been having. That being said, another good friend of mine bought 3 of them on my recommendation (before they starting coming apart) and uses them frequently on his rifles. One of which is primarily used on a 6.5PRC and another on a 300WM. He is super happy with them and obviously has not experinced any failures.
I hope that is helpful.
