I'm Swiss myself and I hope I'm not insulting anybody here, but most Swiss people speak a rather crappy version of high-German with a strong accent and a lot of "helvetisms" (i.e. expressions which are used in Switzerland but not in Germany). In addition many Swiss people will only speak high-German as a last resort.
If learning proper German is important to you, I suggest you go to Germany. Hamburg might be a good city to learn German. IME people up there have much less of an accent than those in southern cities such as Stuttgart or Munich.