Any electricians available? Wire size question...

Wow, glad I asked, thanks for all the help! I'm hoping to get this done sometime this summer, but I'm going to keep my eyes open for a decent price on the cable. I'll probably stick with aluminum, but also agree that it's better to have 'overkill' and go with a larger size.

Thanks again
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Use some Penetrox on the ends of the aluminum wire or you could have a fire in the future as some corrosion builds on the wire surface at the end connectors.