Few years back I picked up a CMP .308 Special with a Criterion barrel. Love it. The Garand is .308 is very nice to shoot.
My experience in years past with the tankers was problematic at best. I don't think the CMP has the .308 specials anymore, but you can get a CMP Garand Rack or Service Grade for $750~850 and for another $300 or so get a new Criterion .308 barrel installed along with the spacer. Sell or keep the take off 30-06 barrel.
.308 on the top. 30-06 down below.
http://i.imgur.com/KauySJo.jpg