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Magic penetration and magic resistance reduction are applied in the following order (applys for armor too):
1. Percentage Magic Resistance Reduction
2. Flat Magic Resistance Reduction
3. Flat Magic Penetration (cannot reduce MR below 0)
4. Percentage Magic Penetration (cannot reduce MR below 0)
This means if you had 50 MR reduction against someone w/ 50 MR, it doesn't matter if you have sorc shoes, hg, runes or void staff, as NONE of those can reduce below 0.
Also, double starks and double abyssal do not stack w/ each other for enemy debuffs.
Though, in most team fights you probably could drop 75-100 MR still, but I would think if you come rolling in with ALL ap characters, they would all just rush a FON/BV anyways.
source: http://leagueoflegends.wikia.com/wiki/Magic_pen
Thanks for the comments! Keep them coming.
Also this reads like speculation, have you actually tried these teams out in a real fight.