i would say, hoya UV filter is enough for normal lens, unless you are buying the high end lens (those that cost 4 digits or more), you might want to really consider buying a good filter like the B+W (which normally cost up to $200 for the bigger lens) to make sure you are making full use of your ex lens.
oh and to clear things up, UV filter has minimal effect on color temperature kinda not visible to the eye, its just to act as a protector for your lens. And yes, the quality differences between hoya and B+W is really significant, if you are using a real high end lens.
in short, at least get a hoya.