Clark barrels are excellent. They are threaded fairly far back for cone style compensators.
If you're looking for match grade accuracy, and plan on getting a gunsmith to match fit a barrel, just order a long unthreaded barrel and have your smith thread it. It's a very simple job. Bar-Sto, Kart, Ed Brown, Les Baer, Wilson, Clark, Jarvis, Schuemann, and KKM all have excellent barrels. Karts are particularly accurate at a good price.