The (debatably) best and most iconic X-Men team, X-Men Blue, was seven members.
The X-Men cartoon featured a now-iconic line-up of Cyclops, Wolverine, Rogue (With Ms. Marvel's powers), Storm, Beast, Gambit, Jubilee and Jean Grey for a total of eight.
In both of these line-ups, I never felt any characters were especially left out, and all had development in both mediums.
That being said, the X-Men cartoon featured (in my opinion) the best line-up of X-Men on one single team, ever.
So, to answer your question, seven/eight seem to do really well, without leaving anyone in the dark.
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