I don’t know of anyone that uses a Ultra Polarizer over standard circular polarizer although I am sure there will be some. Do you already own a circular polarizer as the beauty of these is you can see how much they are affecting the final image as you turn it? Judging from mine I would never need a more extreme example.
Pro-mist filters are a filter that is used in film production mainly although there is no reason why it couldn’t be used for stills. What you will find though is that this kind of effect will be easy to duplicate during post processing using Photoshop or PSP. As most digital photographers now see the software package as part of their kit, this is the modern preferred method of creating these finishes. It saves money for many different filters and saves you from having to carry them around with you as well.
If you are going down the adding in filters route, stick with what most would call essential one and the ones that do work that you would find very difficult to duplicate in a software package afterwards. Circular polarizer’s, neutral density filters to allow for longer time exposures, and a couple of different strength natural graduated filters to hold back the sky when shooting landscapes.
You may also like to look at something like the Cokin filter system as you can slot in virtually any type of filter (of the right size) or multi stack different filters and it then connects to your lens via an adaptor ring. You just buy different size rings, one for each of your lenses and then the same filter/s can be used which is a lot cheaper than buying individual filters for all your different lenses.
Like EosD I can’t tell you where to get the Tiffen filters from but you can try
http://www.srbfilm.co.uk/ which stock probably the widest range at the most competitive prices inc the Cokin system.
Hope that helps
