Acrylics are awesome! They're so bright and opaque. My favourite method at the moment for this sort of style is doing the blocking and background in acrylic, and then, once it's dry, going over the foreground and doing all the fine detail in oil. Doing the foreground in acrylic isn't actually any less bright, I just find it harder to do detail because it dries so quickly and messes up my blending. I suppose it come down to what you're used to though!