65% here
You'll notice too that people in cooler drier climates (ahem, Orange County, CA) usually use higher RH, while people in hotter and more humid climates use lower. This isn't always true but mostly. It also depends on the seal of your humidor. Tupperdore usuers tend to prefer lower RH packs due to stability, while desktop users use higher RH packs due to leakage. It also depends on the sticks, NC is usually higher RH, Habanos usually lower. According to Habanos SA ideal temp / humidity is 61-64°F and 65-70% RH. Bear in mind that RH of 70% at 64°F is considerably drier than RH 70% at 70°F.