I think you want to have the following (at a minimum):
1)An eyepiece that gives you a field of view of over a degree. This will be, probably, a low power eyepiece, and you'll use it for M45, M44, M39, M31, Perseus Double Cluster, Veil Nebula, dark nebulae, etc.
2)An eyepiece that gives you a 30-40 minute field of view. This will probably be a medium power, and will be the right magnification and field for most star clusters (including globulars), most nebulae (e.g.M17, M16), some planetaries (e.g.M27, NGC7293), and a horde of galaxies.
3)An eyepiece that gives you a 20-30 minute field of view.
This will probably be a modestly high power eyepiece, and will be good for small planetary nebulae, small star clusters (including globulars), many small galaxies, and details in the larger DSOs.

Since your scope is a 10", I'd recommend that the above settle in on or about 60X, 120X and 180X.

Beyond that, it's a matter of taste. And you may have special eyepieces for *just* the planets and Moon. And you may find a "perfect" eyepiece for you straddles two categories I mentioned.

But the above would do you well on nearly every DSO except the very smallest and very largest.