I second the advice about working with a nibmeister before you plunk down money on a pen that is more costly than you typically purchase.
I doubt you could switch out a MB nib into a Nakaya.
I have one Nakaya and one Platinum (same nib company) and the writing experience with both has been superb. I also have less expensive pens and the writing experience has also been superb. The key, I think, once you venture into hundreds of dollars or more is to find a pen that is esthetically pleasing to view and hold in the hand and that has the nib qualities you desire.
So for me, I enjoy writing with both the Nakaya and the Platinum in some measure not because of how the nib works, but also the pleasure of looking at the pen (to me it's portable and functional art). Then the extra cost is acceptable to me. YMMV....