find the dryest wood as it will warp the least as the rest of the moisture is taken out.
to help keep it from warping or to help straighten it, clamp it to something flat (table saw etc.) and let it sit there will still be a little warpage and if your building things just get a harder wood and drill countersink holes and let the screw suck it up.
and if you find a nice straight piece of wood, try and keep it the same humidity as the place you bought it from. it *should* stay fairly close to how you bought it.
you mind sharing what your building with your wood? just curious
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