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2 and 4 are obvious choices. I'm not so sure about 1, might tend to 5. You sound like you're not 100% comfortable with the impression you made on 1, and the contact isn't fresh.
Other things equal, it's good to choose people who graduated recently from good places; they'll find the right tone. A solid recommendation doesn't have to be "gushing" - if (5) is someone who tends to sound objective and more reserved, that draws attention to anything positive he does say.
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