16" Lineman boots when it's cooler weather, Wolverine WO-2625 boots when it's warmer weather.
The Wolverines are about $120 USD most of the time... very cheap for something that works so well. I've had good luck with them, great if you're on a budget.
If you've got the money, then the ArborTec Scafell Lite boots would be my first choice for climbing both with and without spurs.
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Pic is the Wolverine boots.