"Montane Minimus Smock -awesome, but runs very small"
I can wholeheartedly endorse this one for Sierra 3 season use. I gave it a full season trial, including one real doozy of a rainstorm, and it performed very well. The wide chest pocket is a very useful feature. I found it light enough at ~5.5 oz and compact enough to also use as a wind shirt, which eliminated another piece of gear. It runs, as Christopher mentioned, on the small side, but at 5'7" & 137# that was not a problem for me. If you are on the stocky side or otherwise largish, you might want to go up a size, especially if you intend to layer underneath it. The only potential downside, as I see it, is durability. I think Dan Durston alluded to that in an earlier thread, and he may be right, especially if you spend a lot of time in thick brush. However, in the Sierra you have to go looking for that kind of trouble so, with that caveat, I don't think it should be a real issue for you.