I like the ⓑ symbol most,

 It is well recognizable, not that hard to type (Alt-24d1 or Ctrl-Shift-u 24d1 ),
it looks a bit like a coin and moreover it is quite similar to
the @, which did become a symbol of the electronic age.

The Baht symbol is also beautiful and the Baht-Cordoba combination
is well-looking and meaningful as well. However I think that
Baht alone would cause a little confusion at least in Thailand ;-)