Bob, the choice in this category and sail size is overwhelming and the definition for a fun board can differ greatly among us. I'll give you some examples of arguably the more popular and consistently high scoring boards from different categories .
-if you prefer longer, narrower "old school" freeride boards -Tabou Rocket, Starboard Carve come to mind
-also old school but faster -Fanatic Hawk and Naish Starship
-still relatively longer but not so narrow anymore-the freerace category like the very popular Starboard Futura
-much shorter, wider and also thinner /extended wind range but slower/ -the new freemove boards with the RRD Firemove as a benchmark /I own a Starboard AtomIQ 110 myself/
-a bit less wide , but generally even shorter and much thicker / so much so in the tail area/, with sharp rails throughout, flatter rocker and less footstrap positions -the significantly faster slalom boards like RRD XFire, Starboard Isonic etc.
-extremly short ,wide AND thick -the light wind early planners-Starboard Ultrasonic; JP Super Lightwind
As you probably know the perception of a "fun" board changes dramatically with chop increase - the more of it and especially the higher it is -a narrower , slower board starts to feel more fun then a wider and faster one . This issue is more of a concern in coastal areas /including the Great Lakes/ and almost irrelevant on smaller lakes.
A carbon construction delivers a significant performance boost in the bigger board sizes and is highly recommended.
Personally for the this sail range I like the freemove boards like the Firemove and the Atom the most for their allarondness in the water and compactness out of it- not too fast or too slow, easy to slog and uphaul onto , huge wind range and forgiving in rough chop . On the other hand some may find them a bit more complicated to get planing and losing speed in jibes quicker /as Reid mentioned/ -demanding more active sailing style compared to the longer and narrower boards of the past. Like the fsw boards in the strong wind and waves categories -they are great allaround but not the best performers in anyone specific discipline. A 2 board combo of a 120+L freemove and a 100+L fsw will be able to cover a 190 lbs person nicely from 5.0 to 8.5 sail range IMHO.
In the pic: Greetings from Tikiman !