[Haskell-cafe] Best Actor system?

[james]

Having been introduced to actors by looking at Erlang, I discovered Akka.

It seems that the performance is pretty impressive and I like the model.

There seem to be several basic Actor libraries in Hackage, but they 
don't seem
to be very actively developed.

I'm more interested in the model for programming within a single runtime
than I am for distributed systems, but message and dispatch performance
definitely is important.

Can anyone share experiences with the different packages?  Is any one
of them stand-out?

Thanks
James