I've been looking at Haskell, Rust and Go for helping with parallelism but decided to go with a less known language: Pony. Not used actors a lot right now but looks really promising.
Right now I found Pony more approachable than Haskell. Maybe because that I never fully grok monads (probably my fault not persevering enough), I always had problems composing monads.
Also the promise of Pony is a garbage collection that is concurrent with program execution and since I want to write low latency server code this feature sounds very appealing.
https://github.com/actix/actix