I've used Carolina, thoroughgood, Justin work boots and red wing inn the past. Not a fan of Redwings any more as they didn't seem to hold up as well. Guy I work with has had good luck with them. He wears them down thru the sole. I'm in a pair of Carolina's ATM and pretty happy with them. I usually buy what's on sale or I can find a good deal on. I try to buy American Made boots for work. For what I do, I'm running a soft toe and sole since I'm mostly in door. 8" boot. I normally look at Unionbootpro, Harry's army supply, northern tool supply strangely had some, or others and just order them. Size has been pretty consistent. I have eye balled Georgia boots a few times. But haven't pulled the trigger on a pair yet. Steel toe and outdoor opens up more options than soft toe 8" boots.
If you have a good boot shop near by, they are always worth a look.
Good luck!