What's the best retail resell value play for the Bathroom scenario below?

(A) An upgraded large 3/2, or 

(B) Keep the existing 3/2.5 where both baths are very small & outdated by today's standards, or perhaps ...

(C) Update both baths and keep them separate?

House that is currently a 3BR/2.5Bath. Considering converting it to a 3BR/2Bath by combining the Half-bath with the Master Bath.  They currently boarder each other and it would be relatively easy (so I think).  I would keep the existing Half-bath door as an external entry point so that guests wouldn't have to walk through the Master BR.  Currently, the Half-bath has one sink and one toilet and is somewhat of a "closet" in size parameters.  The Master's bath is a Full-bath one sink & standard tub/shower (with glass sliders).  My thought is to combine both baths, put a proper shower in place of the tub, a garden tub next to that, then one vanity/sink, then the toilet closest to the "external guest door."

Am I going down the right path to assume it would be more desirable for a home owner to have a larger deluxe Master-bath with a guest door rather than the current setup with outdated and small bathrooms?  Or should I just update both baths and keep them separate?

Thanks BPers!

Ricardo

:)