I love the M14 in all its forms.
ButI wonder.
Why did the FN Fal not make your list?
With its gas regulator it has the potential to achieve nearbolt action performance.
A lot cheaper.
Not too heavy.
Dependable.

Out of your choices I would stay with the Socom.
If youfeel you need a Battle Rifle. Buy One.
But make sure it is one.
MO