Regarding the bonus question, add up the total cost of ownership, and try to account for the intangibles. Perhaps you want to account for the environmental impact of having a new fridge manufactured, so apply a $50 penalty to the "new" option. You don't like buying electricity, so bill that at a higher rate than you actually pay.
I ran some quick numbers, assuming you're going to buy the unit now, operate it every day for 5 years, then sell it. You'll have to plug in your own numbers, but my spreadsheet says you should buy new if you can get it for within $200 of the used price.
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