I know exactly nada about what makes a good potato, but this site seems to know what it's talking about. The first time potato buyer's guide seems like a good place to start, and they seem to have pretty thorough potato reviews.
No no no, you eat the potato for lunch. You don't have it for the uphill trip home, that's when you suffer and freeze. Then get home and feed the chickens.
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That monster in the mirror, he just might be you. -Grover