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Pex question, manifold suggestion and ideas

I’m installing a homerun system with cast iron rads. I have NIBCO oxygen barrier pex from Menards. Will I be okay with this or should I replace with PAP?

Secondly, any manifolds better for this than others? I plan on a Lochinvar boiler with Alpha 2 ecm and TRV’s on each radiator. I would like one with all the bells and whistle add-ons.

Finally, I have to run the s&r lines through the living space to get to the second floor. The walls are all solid brick and we don’t want chases. Is it best to just use black pipe or are their finishing sleeves or something else to run pex in? The ceilings are 10’.

Thanks for all the help

I’ve included a couple pics of the rads. We pressured washed the old paint off, rubbed the rust with an emery cloth and sprayed Rustolium hammered copper. We’re happy


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