Yes he has beautiful birds that is where I got the Orpington's from. And where I will probably get the Brahmas

Just trying to decide on another breed those seem to be the only really rare breeds he has. I want something that will still be worth something to sell hatching eggs for next year. When they are old enough to lay.
Well, penes are rare and will stay rare. But for selling hatching eggs, they are a challenge to hatch so you might have some issues with customers. Cream legbars will be popular forever, but there will be more eggs coming for sure. Rhodebars are also going to stay rare because they are a challenge to work with. Silkies are also always going to be popular, but lay infrequently.
The price on hatching eggs does not only reflect on the rarity of the chickens, but how often they lay, and how much of a hassle they are. Most eggs that will stay expensive will stay that way because hatching them is a hassle. You also need to have enough hens to get 12 -14 eggs ( people expect extras) to sell hatching eggs. How much space are you looking at?
If you could find croad langshams that lay the proper colored egg, you have a waiting list forever. But, I have not been able to track them down yet, as most in the US lay a brown and look NOTHING like a croad.
Another thing you want to do is look for things not heavily represented on the west coast if you are trying to sell eggs only. ( you can narrow that circle down considerably if you are going for chicks) A lot of people prefer to order from their coast, as shipping is evil. ( I had a box this week that took 4 extra days to arrive and arrived FLAT... po said they got it that way ???? Are you saying I sat on the box and shipped it??)
Also if you are selling hatching eggs, try to get a rooster that is not related to your hens. It is not possible in all breeds, but will really make a difference in the long term viability of your eggs and business.
I ship a lot of eggs, but mostly trade, because I don't like a lot of hassle, and I can sell a variety of chicks here. People who buy eggs have crazy expectations, people who buy chicks a little less so, lol.