@Jonaleth:
I don't think that it is possible to craft +80 armor, helms, staffs, or belts. Can you confirm that these things exist?

@Miso_Niz
Your explanation makes perfect sense, thank you! So in the end it would be possible to get 1035 + 72 = 1107 magic which means that it is possible to learn Frozen Orb lvl 15, Nova lvl 15, Apocalypse lvl 12, and Immolation lvl 15.

@ROLpogo: I see. But why 431 points? This number makes no sense. From my calculation there is a maximum of 394 points one can get from level ups and quests, so there is a difference of 37 points. I would understand if the difference were 2*3*3*4=72 points because there are 2 quests that give +3 to t...

Interesting! By all points you mean really ALL points? So you can set your base values in STR, DEX and VIT to 0?

@ROLpogo: That's interesting because my best belt also had 52. I wonder if it is possible to get more or if +50 magic and +11 to all attributes cannot occur at the same time. How did you get the +80 rings and amulets? Did you just craft a million times? What version of the game did you use? Also, yo...

I see what you mean. So far I never got a belt or helm from crafting that had more than +50 magic, but you might be right. Would be nice if somebody could confirm that this is possible.

@DacianDraco: The magic from the random affix and the magic from the crafting don't add up. The crafting overwrites preexisting affixes.

After finding most of the unique and set items and after a lot of crafting I think I can finally tell what is the maximum magic that can be reached by the Sorcerer and consequently what are the maximum spell levels that can be learned. If I missed something I would really appreciate any corrections!...