Do you reload? If not the 260 is limiting OTC. Just some food for thought but have you considered a 7mm 08. Another possibility if you want SA and don't mind the thought of WSM and little more recoil in a light rig - 270wsm? Either would give you a little seperation from what you have already & can be found in lighter frames.

With a .223 and 2506 in your cabinet the .243 seem redundant to me! I like a little more spacing, that's all.