If you're shooting digitally: you could shoot in RAW format and then darken the blues in RAW processing. Works quite nice (for example with Photoshop CS3's new RAW engine).
I do like polarizers & always carry one with me for the skies. But what I don't like about them is that they can 'flatten' the image, especially on leaves & foilage: take out the reflections from the leaves & they'll look very 2-dimensional – much nicer WITH the reflections.
Also: no need for a warm-up polarizer. You could simply increase the colour temperture in RAW (or if you're shooting JPG, set a warmer white balance).
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