I would welcome and enjoy any MS66 examples of classic silver commemorative that you choose to share with us here at the CCF.
A complete 50 coin type set in MS66/CAC is an expensive goal ... should your wallet support it I say go for it.

Repeating the wise advise already given by commems ...gain knowledge of the series and all the individual coins before embarking on such an adventure.
One of the great joys of this type set adventure is that all the 50 coins are unique relative to design ... and each of them carries their own stories not only relative to design/history but from a numismatic standpoint strike characteristics and surface quality.
Knowledge of the coins ... and of your own goals are critical before you begin to spend significant $ on these coins.
I suggest for you a modified approach ...
Consider that a few of these coins are considered grade rarities in MS66 ... and as such just a handful of examples are very expensive at the grade ... purchase those coins at a lower technical grade but still eye appealing to you.
One example ... the 1926 Sesquicentennial half dollar will cost you north of $20K in MS66 ... but is a 'common' $250 coin in MS64.
Your call of course ... looking forward to whatever coins you can share.
David