Is it worth $1800?????????????
Not to me. These are nice guns in very good to excellent shape, but are not mesuem quality guns. If you are a collector, they are good examples of that particular serial number range that they represent.
From what you have mentioned you want, this is a pricey way to get it. And, percentage wise, it won't appreciate as rapidly as lower priced Garands.
These guns aren't untouched or un altered since they left the factory. With the exception of the 2 "bagged Garands" on display at Anniston, they all have been handled and had parts traded around. What is currently on them may or not be what the gun was originallu delivered with.
Also, the CMP collector guns aren't always in as good shape as the correct Garands from CMP. For instance, a "collector" SA rifle from WWII (I know, they don't have any) would normally be in worse condition than a Korean era or later SA.
I have seen many CMP Garands, and most need some TLC in one area or another. Between my rifles and those that my friends have gotten, I have a list of worn and broken parts as long as my arm that had to be replaced. (this is out of 2o rifles or so). For instance, foreign armorers ALWAYS tried to adjust the timing by bending the follower rod. Several countries taught their troopsd to remove the gas cylinder every time the gun was cleaned. During the 90's the CMP was using a water pressure washer to remove grease, and the rear sights were rusting if not removed and detailed stripped soon after receipt from CMP, and the list goes on. On average, I have found the guns usually need another $125 in parts to be "right", sometimes the CMP will help, sometimes not.
As received from CMP, the Service Grade guns are very good buys for the money. Do a detailed IRAN and you will have a rifle that will be troublefree for the next 30 to 50 years (after which another tuneup and you are good for several more generations). During this time, the service grade gun will increase in value faster than that $1800 gun, and be every bit as accurate.
Don't forget, any gun you get from CMP is "luck of the draw". It is worth more to inspect any gun before you buy it, and a cursory inspection is possible if you go to CMP to buy one, but what you want isn't always there.