He based his ranking on sales, resales value, critical review and Grammy wins and came up with the following list. Please note that NOT ONE SINGLE ONE of these albums was produced after 1991, providing more support for my theory that everything written after I graduated from UGA the first time stinks.
#20. Faith - George Michael
Play Album
Year: 1987 Units Sold: 10 Million
SPV: $9.19 Rating (Stars): 4 Grammys Won: 1
Calculated value per unit based on the formula: $9.79
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#19. Appetite For Destruction - Guns N' Roses
Play Album
Year: 1987 Units Sold: 15 Million
SPV: $8.81 Rating (Stars): 4 Grammys Won: 0
Calculated value per unit based on the formula: $9.81
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#18. Purple Rain - Prince
Play Album
Year: 1984 Units Sold: 13 Million
SPV: $8.74 Rating (Stars): 4.75 Grammys Won: 2
Calculated value per unit based on the formula: $9.82
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#17. Houses Of The Holy - Led Zeppelin
Play Album
Year: 1973 Units Sold: 11 Million
SPV: $9.10 Rating (Stars): 4.5 Grammys Won: 0
Calculated value per unit based on the formula: $9.93
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#16. Born In The U.S.A. - Bruce Springsteen
Play Album
Year: 1984 Units Sold: 15 Million
SPV: $8.91 Rating (Stars): 5 Grammys Won: 0
Calculated value per unit based on the formula: $10.29
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#15. Nevermind - Nirvana
Play Album
Year: 1991 Units Sold: 10 Million
SPV: $10.07 Rating (Stars): 4 Grammys Won: 0
Calculated value per unit based on the formula: $10.67
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#14. Van Halen - Van Halen
Play Album
Year: 1978 Units Sold: 10 Million
SPV: $10.23 Rating (Stars): 4.25 Grammys Won: 0
Calculated value per unit based on the formula: $10.84
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#13. Rumours - Fleetwood Mac
Play Album
Year: 1977 Units Sold: 19 Million
SPV: $9.52 Rating (Stars): 5 Grammys Won: 1
Calculated value per unit based on the formula: $11.47
Play Album
Year: 1979 Units Sold: 23 Million
SPV: $10.20 Rating (Stars): 4.75 Grammys Won: 1
Calculated value per unit based on the formula: $12.51.#11. The Joshua Tree - U2
Play Album
Year: 1987 Units Sold: 10 Million
SPV: $11.50 Rating (Stars): 4.5 Grammys Won: 2
Calculated value per unit based on the formula: $12.54.#10. Metallica - Metallica
Play Album
Year: 1991 Units Sold: 14 Million
SPV: $12.08 Rating (Stars): 4.25 Grammys Won: 1
Calculated value per unit based on the formula: $13.38.#9. Led Zeppelin - Led Zeppelin
Play Album
Year: 1969 Units Sold: 10 Million
SPV: $12.83 Rating (Stars): 4 Grammys Won: 0
Calculated value per unit based on the formula: $13.60.#8. Hotel California - Eagles
Play Album
Year: 1976 Units Sold: 16 Million
SPV: $12.00 Rating (Stars): 4.75 Grammys Won: 0
Calculated value per unit based on the formula: $13.81.#7. The White Album - The Beatles
Play Album
Year: 1968 Units Sold: 19 Million
SPV: $12.00 Rating (Stars): 5 Grammys Won: 0
Calculated value per unit based on the formula: $14.39.#6. Led Zeppelin IV - Led Zeppelin
Play Album
Year: 1971 Units Sold: 23 Million
SPV: $12.42 Rating (Stars): 5 Grammys Won: 0
Calculated value per unit based on the formula: $15.44.#5. Abbey Road - The Beatles
Play Album
Year: 1968 Units Sold: 12 Million
SPV: $14.94 Rating (Stars): 4.25 Grammys Won: 1
Calculated value per unit based on the formula: $16.23.#4. Physical Graffiti - Led Zeppelin
Play Album
Year: 1975 Units Sold: 16 Million
SPV: $14.31 Rating (Stars): 4.75 Grammys Won: 0
Calculated value per unit based on the formula: $16.38.#3. Thriller - Michael Jackson
Play Album
Year: 1982 Units Sold: 27 Million
SPV: $13.49 Rating (Stars): 4.5 Grammys Won: 4
Calculated value per unit based on the formula: $17.39.#2. Dark Side Of The Moon - Pink Floyd
Play Album
Year: 1973 Units Sold: 15 Million
SPV: $16.08 Rating (Stars): 5 Grammys Won: 0
Calculated value per unit based on the formula: $18.57.#1. Songs In The Key Of Life - Stevie Wonder
Play Album
Year: 1976 Units Sold: 10 Million
SPV: $16.84 Rating (Stars): 5 Grammys Won: 2
Calculated value per unit based on the formula: $18.71