Edit: Remove this paragraph... I like the virtue that helps practice+adventure, not the one that helps study from vis.
Hmm. I don't think Independent Study is all that worthy. Study from vis is expensive and dangerous, a rarity in most sagas. Study from books is a lot more common, whether the books in a given saga are good or bad.
I think Faerie Blood in general almost belongs. All sorts of possible goodies. But although I consider SFB to be awesome, I think that except for a few cherry picked concepts, FB is not in the top tier of awesomeness. (Book Learner, for example, is generally good. Faerie Blood (Dwarf) is great for Verditius magi.) Faerie Blood (God or equivalent) probably belongs, because almost anyone can benefit from a good Sympathy, yet the best virtue that grants a sympathy is probably the free background: Yes, it grants a negative sympathy that starts off equal to the positive, but if your Warping Score starts at 0, both the positive and negative aspects being at 0, allowing both to become positive. A low Warping score starts one off negative, but it can quickly be made positive.
I'm on the fence regarding Cautious Sorcerer: It is useless when only one botch die is rolled and not noticeable when 20 are rolled. There is a murky middle ground when it is quite useful. OTOH, Cautious with Ability is awesome for any character who often uses a single Ability in stressful situations, because it removes the last botch die. Ceremonial Magic (yes, not everyone agrees with me on this), a supernatural Ability, Sihr, Solomonic X, Concentration, Finesse, Enigmatic Wisdom.... most characters use some ability very often, but not all, so I wouldn't rank this in the top tier either. CS combines well with FM, though. A good virtue, but not a no-brainer. Mythic Characteristic is better, when taking an application that applies to casting (and why not? It is a use of Sta), combining much better with a familiar.
Deft Form is also in the "a no brainer only for certain concepts" category. Deft Form(Me or Im) is extraordinarily good... for characters who cast lots of that kind of thing.
So, Puissant, Affinity, Minor Focus, virtues that grant a positive Sympathy, Book Learner, Apt Student, Independent Study, Baccaluareate, Skilled Parens, Gild Training: Great for pretty much everyone who can take them, and all magi can (well, Tremere cannot take Minor Focus because they are already given one .) Some concepts don't have room for any of them, let alone all, of course.
But if we also include virtues that are just as good situationally, all sorts of things belong. Everything that you listed, certainly. But also Deft Form, Silent/Subtle Magic, Inoffensive to X, Good Reputation, Magical Foci, Charm Magic, Special Circumstances (while performing for a "bard," while in Heartbeast for a Bjornaer...), Cyclic Magic(seasonal): (read 2 seasons, adventure+lab work 2 seasons ftw), Life Boost...