When shopping for a polarizer it is good to know that you can use a linear style with our camera. Not only are they a bit lower priced, but the results can be better.
Search the forum for this topic and you will find a great deal of info.
The UV filter apparently has greater functional value (UV filtering) at high elevations, below 4000' it serves as a lens protector. I have read comments of UV/Hazr filters being helpful too.