I have a WonderMill. They're $300ish on Amazon etc. Works very quickly and can process about 5lbs of wheat at a time (its hopper can only hold about that much). I haven't really put heavy use into it but it's been flawless so far.

(Note: it advertises itself as the "worlds quietest mill"......I definitely don't believe that. It's loud as hell)

Link: Powerful High Speed Electric Grain Mill Grinder for Healthy Gluten-Free Flours - Grain Grinder Mill, Wheat Grinder, Flour Mill Machine and Flour Mill Grinder for Home and Professional Use - Wondermill https://www.amazon.com/dp/B000CPJKWC/ref=cm_sw_r_cp_api_i_F49PHJRMEK98CGR35E9T