I have found Douglas Laing to be excellent, I use quite a few of the "OMC" editions in my tastings.
Murray McDavid also have some good bottlings at very reasonable prices.
I have also found some rather good G&M bottlings, although I am selective when it comes to the "Connoisseurs Choice" range.
In "CC" I found the Bladnoch to be excellent.
In the 'normal' G&M 43% range, the Scapa 1993-2006 is fantastic.