From my experience too, don't go by what the manual says re globes. Both times they have been wrong. Now I will visually check each one - to make sure..
The LED's produce a very 'sharp' light. If those globes are facing out towards the blue target - I would go blue. However , I don't think they would be able to light the mountain area as well. I've found the #555 & #44's tend to mostly light out from the front - not sides too well (if this makes sense)..
Your river inserts - will be a hyper white colour and really pop. Sometimes it is trial and error to. Maybe just order a couple extra (in white) of whats in the mountain and give it a test. I still think you would need difused white to get the same effect.