Re: Hive construction question
Welcome to Beesource!
My opinion is that the best wood to use is free wood. If you are buying wood, these days redwood is unlikely to be "heartwood", and so has no significant longevity value. The same may apply to cedar, depending on your source. Pine is readily available, and generally the most affordable.
If you haven't yet seen Michael Bush's Top Bar page, its worth a look:
-- Victor Hugo -- "Common sense is in spite of, not the result of, education.”