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Hi Mark,
I find a UHC filter works really well, especially in the city.
O3 filters cut out a lot of the starlight so what you see is heavily biased towards emission nebulae- which is great if that is what you want; but the UHC filter allows more starlight through, so you get a more "natural" image, while still increasing the nebula contrast. I find the view much more pleasing. They work much better with galaxies too.
I go along with Allan: both are great (especially with Eta Carina!), but the UHC gets my vote as a good first pick.
- Dean
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