As I dig into the first hundred sample searches or so, it looks so far like the various priority discounts break down something like:
(No card, no status) vs (non-premium card, no status) ~ 8% econ - 14% biz
(no card, no status) vs (non-premium card, 50/75K) ~ 11-12% econ, 15% biz
No status, and a non-premium card, or 35K status and no card, means you pay a pretty consistent 500 points more per award than (35K/card) or 50/75K.