This is where I hunted last October:
Glenmuick Estate I went through an outfitter that was okay, but, in hindsight, I'd suggest booking directly with the estate. I think it will be cheaper. Tell them the yank with all the jokes sent you. There's "hill stag" and "trophy stag"; think low fence, high fence. A hill stag is going to be much more "proper" stalking (and cheaper). You may not shoot the biggest you see, but you shoot the older deer that the gamekeeper wants taken. Do ask them about how they arrange to get your trophy home. I'm still waiting on my skulls and horns that the outfitter took for me. And, if I had it to do again, I'd stay at the Hilton Grand Vacations at Craigendarroch Suites, close to Ballater which is just across the river Dee that is at the base of the estate. If you're going in July, you could add on a roe buck.
Wherever you choose, have a great time.