If you shoot a Barrett, you'll see the proof in the pudding.
I've heard nothing good from the Safety Harbor set up. I've got a friend with a Bohica upper he bought for shits n' giggles. Said it won't group for shit, but it's fun non the less. Have you inquired into the M99? Not a bad price for a quality rifle:
http://www.armslist.com/posts/81046/lexington-kentucky-rifles-for-sale--barrett-m99--50-bmg-with-nightforce-nxs-scope-5-5x22x56
It's sold, but for a package deal, it ain't bad.