I would stretch my budget and get the Barret. You will only regret the initial sticker shock and that will be forgotten shortly. You will not have any what ifs about your choice.
A 6.5 or 308? I would see what came along first and let that decide. Here in central Tx. the gas stations have Creedmoor ammo. Both can make a great ladies or youth rifle but easier if you hand load.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli