Where should I start with Francaix?
As Todd says, all but maybe 2 Francaix works are pure joy, but perhaps the piano concerto, double piano concerto, and piano concertino are good starting points, or a collection of chamber music (like the wind quintets and L'Heure du berger). There's a wonderful miniature oboe concerto called L'horloge de Flore. The ballets are all on Hyperion (including The Emperor's New Clothes), which makes them more expensive to collect.
You'd particularly enjoy the conceits behind some of his solo piano works: "Five Encores," all named for the reason you might play that particular encore (No. 3: In case of success, No. 4: In case of triumph, No. 5: In case of delirium!), and the "Promenade d'un musicologue eclectique," containing a series of affectionate portraits of his favorite composers, and then a very
not affectionate parody of 12-tone

Francaix is a perfect choice to go alongside Haydn, Dvorak, J. Strauss, and Chabrier. Hmmm, wonder if Handel would fit here...
Edit: Dug up two (very old - 2013 - I often don't remember the works anymore!) reviews I wrote for MusicWeb covering
orchestral and
chamber Francaix, and a couple MWI reviews of other music by
other people which you may also
find useful.