I guess at this point I'm wondering why you want to go for a staff which is big and not handy when we both agree that we'd like something that is much more handy.
... But I don't? Unless we are very succesful, I'm saying our first channeling implement should be a sword, because a plain greatsword is plenty serviceable.
She is fine and pretty dang cool as a mater of fact, but a frequent topic that I agree with that comes up is that there are many situations which she could feasibly get into where such "need it NOW" is quite helpful like against assassins or surprise ambushes. And it also hits one of my thoughts which is "Okay, if we have this cool thing why are we not applying it to as many situations as we can?"
And like I said, I agree with you. An athame or something of the sort would be damn handy.
Higher Magic seems to give a better 'margin' for casting challenging spells in diffcult situations (when tired, or in combat, etc)
we want the staff for when we start with battle magic. but that is a ways off at this point.
And the point is, in those situations, such as casting battle magic, or dispel-offs, we have the little room we need to swap implements.
To address everyone at once, because people are getting lost in the argument:
1) It's apparently much easier to enchant a "staff", i.e. a +1 magic thingy, when you have an object roughly the size of a staff.
2) So, I propose we enchant a greatsword. It's virtually all benefit: it serves as a decent melee weapon in a pinch, we are highly familiar with it, and even if we get a super-stabby runic sword, we can just carry two, Witcher style, and the similarity should make quick-drawing pretty easy with a bit of practice. Boney already said that carrying two swords isn't an issue.
3) I nonetheless agree that something wand-sized would be tremendously handy. But that's harder to do, and doesn't seem terribly necessary when the vast majority of our magic which benefits the most from it isn't the sort of thing we'd do in the middle of a furious sword fight, i.e., we'd have the seconds to swap implements even if we were using a less handy one. And we can always cast without it, a +1 increase is notable, but at this point, it's a far less drastic gain than it'd be back in Stirland, when we were rocking magic 4-5.
To sum it up, the un-handyness of a staff-sized tool isn't a real problem, and we might as well make it a sword, because we lose nothing from doing it.