First, an older proven caliber, 223 rem is good but how about 243 or 308? If you reload it would be very flexible. As they grow , and rifle ownership becomes restricted ammo and component availability might be a concern.
Second, the rifle itself should be of a known quality, and up to a lifetime of use. That is all up to you and your budget.
Thirdly, quality scope, good glass will improve a marginal shooter. But cheap glass will ruin a great rifle.
