@cloves-fibs0f - thanks for the update! Glad the journey is going well.
For the G harp, if you’re sticking with Hohner, I’d highly recommend a Marine Band Deluxe. I prefer the tone to the Crossover, better tuning for chords than the Crossover, and it’s cheaper to boot!
3rd position in it’s easiest form is best for a “Dorian sound” (Minor with a major 6th scale degree. D to D on the white keys. Riders on the Storm, One Como Va, So What, Messin’ With the Kid…)
Natural Minor harp plays in “Natural Minor.” 
So you’ve got the minor 6th scale degree accessible. (A-A on the white keys, The Thrill is Gone, Saint James Infirmary…) It’s really nice if you have a i and a iv in the chord progression, you can play those chords.
vs
Regarding Key labels - Lee Oskar labels them in the 2nd position key. So if you want to play an Am blues, you ordered an Am harp.
I ordred a Hohner Natural Minor from my customizer and asked for an Am Natural Minor, and what I got is a harmonica that plays in Em!! Oof. 
To me it’s weird that it’s labeled “A Natural Minor” when that’s not the key you can play in. I’m not sure if that was him. I think that’s how Hohner labels them. So just ask if you’re buying a Hohner and confirm. But I beleive a “C Natural Minor” Hohner harmonica plays 2nd position in the key of Gm. So confusing!
Hope that helps.