I have a 32 Fountain Sportfish Cruiser too. Its the best I've been able to find, but I want something bigger. Nothing out there!
So I am almost certainly going to build custom. Funny thing is, when I show the design concept to builders, they say "No way, will never sell" and when I show it to people actually ON THEIR BOATS, they say "I want one!"
Regarding beam: Getting a wide load permit, and getting down the highway is easy even with lots of beam.
Getting in and out of launch ramps, however, is a different story.
At almost all launch ramps, I have very few inches on either side at least once, if not several times, getting from the street to the ramp and back out again -- and my boat is 8'4" wide. If the boat was 9 feet wide, I bet I would have gotten stuck several times this year (I did get stuck once on a busy weekend). If it was 10 feet wide, for certain I could only launch at three ramps between San Francisco and Newport Beach.
So a wide beam boat is totally impractical if you expect to keep it on a trailer and actually use the boat. Keep it on a hoist, launch it once or once a year, then its no big deal. Do it every weekend? No way.