I too love the 3-4" fixed blades, but there isn't a ton of selection and many of them shrink the handle so much they don't feel right. I really like the older G10 Benchmade Nimravus but it's 4.5". I don't like the newer AL handle models as much, but I really thought they were a good blade shape and handle size. I tried to like the cub version and the blade is perfect, but the handle was just a little too small. It wasn't a pry bar but it cut very well. Tried the ESEE 4 and hated the handle, too short. I have a Rob Simonich Cetan from many years ago that is one of my favorites as well.
I also really like the looks of the Freeman 451, and if you want really thick the Emerson Police Utility Knife, Spartan Blades Phrike Knife.
You're right though, I've still not really found the perfect 3-4" fixed blade. So many of them shrink the handle too much, I suppose going for a more compact platform but I think there's a market out there for a full size handle with a 3-4" blade especially since fixed blades seem to becoming more common for EDC and many locations limit blade lengths to that 3-4" range.