You can change the Hue, Saturation and Luminance in ACR by clicking on the HSL/Grayscale tab which is next to the details tab where you can sharpen or reduce the noise. It gives you much greater flexibility than the RGB available in the Photoshop saturation tab. I increased the saturation for blue and probably dropped the luminance a bit. In ACR, you can change HSL for Red, Orange, Yellow, Green, Aqua, Blue, Purple and Magenta. Do your saturation work there and I agree, ignore the saturation slider on the basic page.
Once you've made all of your adjustments in Photoshop, you can always use a saturation layer or VIVEZA to oversaturate your photo!
LOL on the saturation - though I think even Al has to admit I have toned that back a bit recently. With the Carl Zeiss lenses, I am finding the color is so contrasty and snappy, that it is already saturated looking in many cases. I have also learned from experience that in Viveza, as you reduce brightness, the saturation of that part of the image seems to pop more and that you really have to be careful. Also, in many cases, increasing saturation digitally (i.e. with software), destroys detail, sometimes just creating a blob of color.
When I am as old and wise as Al, I will probably have decreased it even more
If it sounds too good to be true, its probably . . . .