Don't buy BCL, way too many people have had issues and it sounds like their lifetime warranty is awesome except that there have been a few reports from guys who have struggled for months to get a reply from BCL just to send it back for warranty, then they waited months before hearing back from them once the rifle is with them.
Stag also has a lifetime warranty which includes the barrel so if you ever shoot it out you get a free replacement.
I wouldn't bother with a 308 and 6.5CM upper. There is nothing a 308 can do that the 6.5 can't. I have semi's in both calibers and the 6.5 is as good or better in every category other than factory ammo availability and no surplus options. Once you own the 6.5 you won't find many times that the 308 is a better choice for the days activities.
My advice is to buy a Stag in 6.5CM and spend the rest of your budget on glass (maybe save up a little more for the glass).