John, don't forget to end the quote's with [ /QUOTE] (remove the space).
For many months now i've tossed up the idea of getting a UHC or OIII, and I looked at the Orion Ultrablock at well which is a little bit cheaper.
$180-$190 for the astronomik UHC/OIII isn't cheap, and it's probably not something you're going to use every night - as John B says
but remember filters really only improve the views on Planetary and Emission Nebula
Having looked through xstream and Rodstars OIII filter on M42, NGC2070 and Eta Carina and some planetary nebs at the SPSP, it does give you a different view.. more detail in some areas but less in others.
I still want to get one, but they're just not on the top of my next-to-buy list anymore.