I only use the B60 filters--they're so convenient, and if you wait and watch on the giant auction site, you often find a nice deal.
I do not use UV/protection filters much these days. I used to to keep one on all the time, then I realized I'm careful enough with my camera it was silly to put an additional piece of glass in front of such a nicely coated lens. I now keep one filter on hand in case it's misty/dusty out or sand is blowing, etc.
I use B+W, Heliopan, or Hasselblad-brand (most are made by B+W I think, and just re-branded) filters. I wouldn't put a Tiffen filter on my lens unless it was a higher-grade multicoated one. The cheaper ones seem to just increase the risk of flare. They do protect the lens, though many will argue the multicoating is darn tough and really doesn't need protection in the first place.