Okay, first off, I don't have personal experience with the Forests and tubes, but I do have experience with the Forests and fair range of amplification.
My first question would be: when are you planning to move to tube monoblocks? If you like the forests, and plan to move to tube monos at some point anyway, then I wouldn't personally get the Hawks in the interim. I don't think they're bad speakers at all, but the forests are that much better, and that much more noticable of a jump from the arros (which are great little speakers, btw).
I guess if you're already planning on moving to monos, then I'd go with those first, and then upgrade the speakers as funds permit, that way you're not listening to anything underpowered. I don't think the PrimaLuna would sound bad with the forests, but I doubt you'd be getting as much out of them as you could with something a bit beefier.
My first question would be: when are you planning to move to tube monoblocks? If you like the forests, and plan to move to tube monos at some point anyway, then I wouldn't personally get the Hawks in the interim. I don't think they're bad speakers at all, but the forests are that much better, and that much more noticable of a jump from the arros (which are great little speakers, btw).
I guess if you're already planning on moving to monos, then I'd go with those first, and then upgrade the speakers as funds permit, that way you're not listening to anything underpowered. I don't think the PrimaLuna would sound bad with the forests, but I doubt you'd be getting as much out of them as you could with something a bit beefier.