pbrktrt beat me to it.
At least a Service Grade Garand, but only from the CMP. Why? You will know that all the required parts are in it, the parts were not altered, and that it will function safely.
Any extra cash could be spent on M2 Ball Ammo. I will never gamble a heap of cash on an inflated-price, unknown M-1 at a gun show, nor at a gun shop etc.
My "Gun Guru" retired from the Navy Rifle Team, won over a dozen Garands in matches, and he always recommends the CMP.
You might realize that all parts were mismatched during the rearsenaling process.