I am more curious what Chao's mother or father might look like which might give a hint as to who Negi ends up with, since one side has to have some link to Negi.
As to the staffs Negi wouldn't need two staffs. The funny thing about time travel is (at least I think this is how it would work) if he goes back in time to give himself the staff when he comes back to the future it is likely he will suddenly have his staff again since it would have existed in the past and at some point have to make it back to the future, his present... at least I think that is right.
It gives one a great sense of statisfaction to do it in perfect unison. ~ Michelle Cheung R.o.D the TV