Boy I don't know Clark, I see where Don3a averaged 30 lbs per bush over his four U of S bush cherry varieties, and his looked to be a maybe a tad over 6'. I'm extremely envious after reading through that Romance thread. I have the 5 producing CJ's that are pretty darn big with the biggest going 11-12' and the others closing in but all probably between 9-10' and pretty close to that wide. I averaged 29.7 lbs on what look to be much larger bushes. Very happy with the production, just wish they would have done it at a more reasonable height. I'm going to prune them as well as open them up some late winter. But seeing the pictures of what Don3a has going on up there, and hearing of the production, that's more what I was hoping for. Very happy for Don too!
But I get what you're saying Clark (and Bob) a small bush (even at 30# of fruit) will never make what a single Montmorency tree would.
If I were limited to three varieties I'd have to say with caveats: McIntosh apple, Redhaven peach, and probably Montmorency cherry.
I say Mac only because it's been an awesome tree for us, and we like it for all purposes. But..., Empire impresses more with each passing year. (And I'm still awaiting GoldRush and Macoun..., and others)
I say Redhaven now, but maybe I'll get fruit from Madison, PF17, or Intrepid this year and have a change of heart. (...or Reliance, Contender, Indian Free or PF24c next year) But the fresh RH off the tree last year was pure heaven for someone not living in the heart of peach country
I say Montmorency because they're hearty and reliable plus have a large enough pit to use a pitter on. (Otherwise I'd say Early Richmond, it's prolific and the taste is other worldly, but that tiny pit... 22 years of that's a good plenty) And I'll possibly have Crimson Passion fruiting this year, and Juliet next year so...