If you already owned a 3 inch apo would you also get a 4 inch apo?

I have a 3 inch apo refractor and I am interested in also owning something with more aperture to complement the little scope. Is there a big enough difference in the 4 inch apo compared to the ed80, to justify the purchase? Or, should I save a few bucks and complement the ed80 with a ten inch dob? What would you do with a limited budget. Note: both apos are of the same brand and quality.