First, I assume you are shooting digital and not film....
If you use Auto White Balance or set a Custom White Balance, the warming filter's effect is cancelled out. If you are getting too cool images now, you'll still get cool images even with the filter. (Bedt to have a calibrated computer monitor to view and evaluate your images, though.)
Changing color temp such a small amount - i.e. the amount of an 81A warming filter - in post processing will do no harm. There is no advantage to applying it at the time of capture, with digital.
If you wish, you could use Warm Cards
or similar and set a Custom White Balance that is warmer than usual, at the time of capture. Using a target for the Custom WB that's lightly blue will "fool" the camera into compensating the opposite direction... i.e. a warmer image.
Back in the days of film... we used UV, 81A, 81B, 81C filters all the time. Combining an 81A with a polarizer made a lot of sense, to avoid stacking filters.
Today shooting digital I don't bother carrying or using warming filters or any other type of color correction/conversion filters. It's easy enough to set a Custom WB, or use Warm Cards if I want to warm the image a little, and/or to correct in post.
I can't tell from the description if those Moose filters are multi-coated or not....
This Hoya is multi-coated: http://www.bhphotovideo.com …rcular_Polarizer_HMC.html
(Hoya makes some other multi-coated CPL filters, including their "HD", "Pro 1" and "EVO")
Or this B+W: http://www.bhphotovideo.com …777-REG/B_W_66044843.html
(Note: B+W also offers a more expensive Kaesemann CPL.)
Or this Marumi: http://www.amazon.com …rds=marumi+72mm+polarizer
(Note: this is a "slim" filter... you may or may not need a slim, depends upon the lens it's used upon... slim filters are usually a little more expensive than standard filters, and some of them don't have front threads so you need a special cap for them.)
There are other good quality, multi-coated circular polarizers by Tiffen, Kenko, Zeiss, Rodenstock, Heliopan, Nikon