It depends, the SAV-1 is adjustable to 14 ounces I believe, while the SAV-2 is adjustable down to 4 ounces. How light do you want the trigger? For most purposes, the SAV-1 will do just fine.
sav1, i have mine set to 1.3 pounds... make sure u have the sear set right, or you will get "slam" fires from dropping the bolt hard... test the crap out of it before u put ammo in the gun...