Which deep sky filter??

Hi, I have a 16 in f 4.5 dob and live in the suburbs of pheonix. I have always wondered about deep sky filters but never known what to get. I have pretty bright sky's to the south and pretty dark to the north. What would be a great all around filter for this observing site? Broadband, Narrowband, UHC, O III...? I'm not very knowlegeable about wavelenghts, but I want something that will cut down on the brightness of the sky, show significant improvement on reflection and emission nebulae, and show at least some improvement on galaxies and clusters. Does such a filter exist? What would the best compromise be? Thanks guys.

The general consensus is that a narrowband filter improves the view of the most objects, though an OIII filter is also useful. Here's a page that compares narrowband, OIII, broadband, and H-beta filters, with detailed notes how each filter affected each object:

http://pages.sbcglobal.net/raycash/filters.htm

Marc,

I have an 18" f/4.5, and live northwest of Portland. Regarding filters, a narrowband filter, such as an O-III is pretty useful with a broad range of nunular objects. I also have a H-B, which is also narrowband, but useful only for a handful of objects. Finally, I have a UHC and broadband light pollution filters, which I just don't use much. I got the LPR filter with the idea of using it for backyard observing, but anymore I prefer to drive to darker locations for serious observing, which makes using the LPR filter moot.

Clear, dark skies,
Howard