You don't need 70/30 tires to run gravel and hard pack dirt roads. You can do that on regular 90/10 adventure touring tires or even regular sport touring tires. If the gravel looks like it could get deep, air down the tires a little (you have to do that on the more aggressive tires too). For the most part, I don't even bother airing down, it just goes through those roads at normal street pressures. Additional bonus of not airing down (or airing down only a little), when you are going faster than you really should on that better hard pack section and you happen to hit a rut, your rim is better protected.
Unless you are planning on tackling wet/muddy dirt tracks (not wet hard pack roads) I'd get a set of Anakees.