Lithl, I was in getting some food for the family this evening and looked at your signature picture. My five yr old is presently into My Little Pony on Netflix, so as I'm waiting for the order, looked at your signature picture and thought, hmmm I can name half those ponies. Totally not on topic, but thought that was pretty funny.
1218, as at the moment that is the current amount of possible different commanders. After that you are just repeating commanders. with a pool of over 1200, there should NEVER be a reason to repeat commanders.
Now that said, I feel the quest depends on how often you play. I am contempt's with just a few, I did once have a goal to make 32, (One of each color combination including colorless) but now I just want to build a few and play with them. I don't have a job right now and over 6k in debt. So I need to first pay that off before building more decks.
But the real answer depends on how many you play. Do all your decks get love? If not, you have too many decks. While I do have other decks, I usually play my Dragon deck. So I technically have too many decks.
I don’t think you’re considering all the possible permutations of partners. That adds another 1400 or so.
also why can’t you make the same commander twice? Some commanders are versatile. I’ve made a deck for plargg based around sunforger, and one around reanimation, for example, and I’ve got even more in the works, because there’s a ton of directions to go with him.