I have had quite a number of 223s over the years. The only one that has stayed, and will never leave, is the Kimber Montana. More precisely, once I got it the rest became dust collectors.
A no-brainer, be patient and find a used one.
Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!