Vortex Viper 6.5-20. A bit over $400, but if I had the coin that would be my choice.
I've read good things about the Millett TRS, Natchez has them on sale now.
Any of the calibers you mentioned are good choices, but I'd obviously put the .223 at the bottom of the list unless you shoot factory ammo- or the 500/600 yard shooting is minimal. It has ballistics far inferior to the others at that range.
My choice for LR is a 7-08 Savage I built, tackdriver I shoot out to 1000 with 162 grain AMax's. It's a great compromise between ballistics and barrel life.