The "right" opportunity for a new business venture basically depends on three factors ...
Is the opportunity itself attractive? Is the problem solvable, important, timely, in a favorable context, and potentially profitable?
Is your team really interested in this opportunity, passionate and committed? Do you all like the challenge? Do you all like doing what the tasks it will take to be successful, particularly the mundane?
Does your team have the skills needed to translate the opportunity to a successful business venture?
If you answered "yes" to all three above, you're off to a good start!