I might be on this board more in the immediate future.

We're building a new house and our plan call for 12 - 8' x 8' x 10' posts for carport and porch posts.

They will be painted with minimal trim top and bottom. I don't know that I need treated necessarily since they will be primed and painted and kept off the ground, but what wood species would be best (remain straight w minimal cracks)?

TIA

IMHO
YellaWood/equal
https://www.yellawood.com/media/1911/yw-columns-warranty-426.pdf
Redwood
Cypress
Anchored T&B, raised off conc. a bit - ref. Strong-Tie items

Ask about Narrow Wall Bracing, even if not required (NWB CODE is to prevent wind forces blowing something over or more prudently, resisting a frame from "leaning" over time; again, Strong-Tie may have some "moment" connectors to serve.

Thanks guys.

minimal cracks = not cedar or pine.

I'd use woodtone real posts or absolute posts. Then you won't have to worry about any of the splitting/twisting.

We used cedar trunks for ours. They were debarked and aged naturally. Personally, I like the rustic appearance of it over a milled piece. No checking of the wood happened that was of note.

Either use Woodtone posts or frame posts with dimensional lumber and wrap in 1x Woodtone material. Paints great and has the look of wood.