The sound and feel of Alps are highly dependent on the construction of the keyboard and the cleanliness of the switches.
I have a SIIG 84 with Monterey blues. Unfortunately, the design of the Return key seems to require hitting it dead center to avoid a very wonky feel. I also have an Ortek 84 with white Alps clones and a SIIG Suntouch Jr. with white Alps -- either of these sounds and feels better to me than the SIIG 84 with Monterey blues.
My experience with blue Alps is very limited. I recently bought a Leading Edge DC-2014 with blue Alps. I like the smooth feel and subtle click, but the overall sound of the board is somewhat plasticky and hollow. At about the same time, I got a Northgate Omnikey 101 with white Alps, and I am typing on it now. The overall sound and feel of the Omnikey is solid -- as expected from the extensive use of steel in its construction. I also prefer the standard ANSI layout of the Omnikey, but I would prefer a smaller board -- TKL, or even better, 60%. As it is, I remap all my keyboards to a HHKB-like layout.
As for the "Alps-inspired" Matias switches, I've tried all three varieties (Click, Quiet, and Quiet Linear). Of these, I prefer Click and Quiet, with some preference for the Click. However, the Click switches are loud and rough, and the Quiet switches feel mushy when bottoming out. Nevertheless, Matias provides the only way to purchase a new keyboard with Alps-type switches, and I have a KBP V60 with Matias Clicks and another with Matias Quiets.
Putting all this together, my to-do list includes building at least one custom 60% board with Alps blue or white switches, dye-sub PBT keycaps, and HHKB layout. But here again, I need to prepare for some disappointment, because the sound and feel of a keyboard does not scale as one might hope when going from full-size to 60%. I have seen more than one report from someone who has built a 60% with blue Alps expressing some dismay that it was only "meh" compared to a full-size blue Alps board that they had tried previously.