Thank you for the useful information.
So, considering that I occassionally obtain deb packages outside of the repos, I should probably install the 32-bit version (Mint Main Edition).
But, just what are the consequences of installing a non-repo 32-bit deb into X-64 Mint?
And, what if a deb line is needed to be added to /etc/apt/sources.list in order to obtain a software. Is this the same as get debs from a source other than the repository? Example: tor (although available from the repo, torproject instructs not to use it but to add a line to the sourses.list (http://www.torproject.org/docs/debian.html.en
-- “Do not use the packages in Ubuntu's universe. They are unmaintained and out of date.”)
On the other hand, probably not DeVeDe, which will be missed.