S.C.:
I'll second Orlando's vote: go for the CMP Garand.
Now, I quite understand your concern with price -- aren't we all? -- but take a look at what a Springfield, Inc. (the commercial outfit) gets for their M1A / M1A "Socom" rifles. Can you beat the price at gun shop or at a gun show for a used rifle?
Maybe.
OK, now the Polytech M14. As I understand it, it's of Chinese manufacture, and while it's probably serviceable, some of its metallurgy -- particularly in its bolt -- is "iffy." Additionally, U.S.-made parts, specifically in the gas system and in the sights, tend to be unusable on the Polytechs. (Anyone else out there know more about these? Please, guys, give us a hand here! [grin])
Are the CMP rifles "beat up?" Sure, some are. Again, recognise that in most instances these rifles have have been in the hands of troops for a very long time. Some have been rebuilt, some better than others, no doubt. That said, CMP has an enviable reputation for standing behind what it sells; if it isn't satisfactory, they'll make it right. In all fairness, Springfield, Inc. enjoys the same reputation, so that's a wash.
Ammunition is another consideration, as Orlando has already pointed out:
military .30-'06 is readily available while
military 7.62x51 isn't, and commercial .308 (which is
not the same thing) is expensive as the dickens. (In either case, firing commercial ammunition in either one is not a good idea, although the M1 is more critical in this regard.)
Here's one more suggestion before you make a decision: find a shooting club somewhere near you that has a high-power rifle range. Pay 'em a visit, and find out if any of the shooters there have a M1 that you may shoot. (I'll almost guarantee that any M1 owner is
delighted to be asked.) That done, you'll have another point for comparison.
And here's the web address for the Civil Marksmanship Program (CMP):
CMP Home
That'll give you access to all the products, prices, and eligibility requirements -- along with a lot more.
Hope the helps.
Ben Hartley