No the Stingrays went to a taller mast and a taller slightly squared off sail about 15 years or so ago but still stayed light weight. The F18's builders realised what an exceptional boat it is so they copied it, unfortunately they weren't clever enough to build light boats that last so they made them heaps heavier. I believe the Stingray would qualify as an F18 if you strapped one of your kids to the underside of the tramp as a penalty weight.
I don't know what budget you have, I was considering the following boat for me but I've decided on another one so here's the pick of the boats available
Its one of the last ones made a 500+ sail number only had 2 owners
Foam sandwich hulls white in colour
1 set of sails used twice would have cost more than $2000
1 set of sails used 12 times or so
Dry hulls, shedded, comes with beach roller, trailer, 4 harnesses, numerous PFD's
The current owner used to go around Australia competing successfully
Fully tuned competative boat ready to sail less than an hours drive from you and take to the Lake Bonney regatta on October 5th.
Nothing to spend ready to go $3500
I know of a small rig for about $700 in reasonable order but nothing like the above one
PM me if you want the owners details.