I am not sure what your subject matter will normally be. But, many of us that use transparency films make our selection based on our prefered color pallet. Personally, I have been using Fuji Professional slide films almost exclusively since the introduction of Velvia in 1991. This is a beautiful, fine grained, very sharp, transparency film with very bold color and high contrast. It is a favorite of landscape photographers. This was probably the first very "punchy" film that Fuji introduced and has had a tremendous influence on the introduction of many subsequent offerings by both Fuj and Kodak. This is still my first film of choice for 35mm, 2 1/4", and 4" x 5". Many of us rate Velvia at ISO of 40 even though Fuji rates it at ISO of 50. The film does work well with polarizing filters, however a warm polarizer may be a better choice.
Next in line of the slower Fuji Professional Transparency films are Provia 100F, Velvia 100F, and Astia 100F. Fuji has been tweaking these films for some time. Provia is a very sharp transparency film with fine grain, good color (not as bold as Velvia), and less contrast than Velvia 50, and pushable to ISO 100 (with the usual increase in contrast and grain). Velvia 100 is even finer grained than Velvia 50, very saturated (but not as much as Velvia 50; a little more neutral than Velvia 50), very sharp, less contrasty than Velvia 50, and should be pushable to ISO of 100 (with an increase of contrast and grain). Provia 100 used to be my second choice for transparencies in all sizes but, will be replaced in all likelyhood with Velvia 100 as my second choice (as when need faster film for depth of field or windy conditions). Astia was developed largely as a studio film rendering skin tones accurately and with the reputation of not blocking up in contrasty situations. Astia is another very sharp, fine grained film, with less bold color (more neutral) than either Velvia, and less contrasty than the Velvia films.
Any transparency film will generally only record between about 3 1/2 to 4 stops of light. A 5 stop lighting range will result in recording from clear to black. One must be very careful in exposure of any transparency material. This is partially why checking exposure range of highlights and shadow areas is helpful with a spot meter. If you are in this exposure range, a trick that I use for exposure is to meter on the brightest part of the scene (generally sky or clouds). When the brightest part of the scene is known, use this as your exposure but, open the aperture (and/or adjust shutter speed) by 1 1/2 stops. Then bracket in 1/2 stop intervals as usual. This allows the brightest part of the scene to record some detail on the transparency. This is the same idea for correction of a scene of white snow or white sand. One or 2 of the bracketed shots is almost invariably correct and very usable.
Rich
http://www.nelridge.com
richard@nelridge.com