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QTip, the best gauge for how big or small a pot is, is SPR. It basically tells you in one number.

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With regards to SPR, at what SPR would a pot begin to be considered "big"?

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Although you will probably get a fairly specific response, it's my opinion that thinking in even fairly rigid terms can be extremely dangerous. For example, you could have 2 hands with the exact same SPR and one hand is a big pot while the other is a small pot simply because of a difference in how the opponents play postflop.

Edit: to clarify, if you are playing a hand and it is likely that no matter what happens you or your opponent will commit, you're playing a big pot.