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Wow, you've got good chicken-math logic already
Did you mean the
Brinsea Mini Eco or the Octagon? Eco Minis are really fun because you can watch the pips really clearly, and they're easy to work.
There are a couple drawbacks you'd probably find with a Mini, though.
First, if you fill them, they're harder to hatch in because of the small space, so you might want to borrow a Hova-bator or Little Giant styrofoam 'bator from a chicken-friend for the hatch.
Secondly, with 5 rural acres, why start so small?
It's so fun, you'll have to get more Ecos soon! No, really,
do start small. Do. Do. Do!
If you start out with silkies or bantam Polish crested, or Sultans, you'll very likely find great homes for the cockerels you hatch, anyway. People love poofs, in my experience. Unusual colors of a popular breed are great too.
My six-year-old is tiny, and even though the silkies in the flock were all hatched with her in mind, the smallest hens (Old English Game Bantams and Belgian Bearded D'Anvers) are the ones she carries around and plays with.
Her hands can grip them better.
Have fun!