I think it all depends on what you want. Nationalism and "Assmilitationism" are strategies to achieve an objective. Your post begs the question of whether African America should be striving for a free and independent African American land or whether we should be looking to maximize our productivity and happiness and influence within the United States.
We've debated this question quite a bit here and I think you'll find folks on both sides of this particular fence. I think there might be more on the nationalism side if someone could paint a clear and tangible picture of what the vision (and path) of that strategy is.