Not aware of any designed specifically as single-handers only.

Later model Stealths have canted hulls - these are the "Stealth F16" ones. I do know of one of the earlier boats that has been converted so that it now has canted hulls. I haven't sailed it so I can't compare it to the uncanted hulls on my boat (that particular boat also has had T-foils added to the rudders by the owner).

G