Help! Which PMN Caecilia package should I license?


I want to license the PMN Caecilia family in OT (all the versions, but I don't need Euro/foreign characters), and I'm overwhelmed trying to figure out which website to buy from and which package to license.

Linotpe offers PMN Caecilia Complete Family Pack in "Open Type Com" for $310 and in "Open Type Std" for $195. They're both 8 fonts. Reading the Linotype Support area on OT did not enlighten me as to the difference.

FontShop and many other websites also sell Caecilia packages. I've spent way too much time trying to figure this out and would much appreciate any advice!