Lumicon O-III or UHC Filter

Hello, I'm looking to buy my first nebula filter. I have an Orion Dobsonian XT 10 reflector. The problem is, I have a 27 panoptic (2 inch barrel) and Type 6 Naglers (1-1/4 inch barrel) and don't know which filter to get. I was thinking of immediately getting a 1-1/4 lumicon UHC filter and then saving up for a 2 inch O-III filter. Do you think this is a good idea? What is the maximum power that you can use O-III filters for? The 27 panoptic gives me 46x while the other 1-1/4" eyepieces give me 96x, 142x, 189x, and 250x. I was planning on using the UHC primarily on planetary nebula (M27, M57, Owl nebula) but I read that the O-III is better for planetaries and the UHC was better on emission nebuala. I also read that some objects (Veil, Orion, Lagoon, etc...) look great under the O-III filter. Please give me some advice/information so I can make a wise purchase.

Thanks, Bryan

I'd say go with the 2" filter and screw it into the front of the diagonal, that way it'll work for all eyepieces.

There's really no separate maximum power for using a well-made filter, other than running out of light.
The UHC is more versatile, the OIII better for some objects. See this discussion: http://www.cloudynights.com/howto/filters.htm

Finally, also consider this filter: http://www.astrovid.com/Astronomik%20Filters_files/Astronomik%20Filters.htm (I'd rather link you to Anacortes, but Herb apparently doesn't sell these?). Prices are comparable to the Lumicon, but the filter material/coating is reportedly more durable and the glass is polished better as well.

The OIII is better on both emission and planetary nebulas. It's only problem is that it extinguishes stars too much for some people's liking.

I loved and used my O111 for years, until I also got an Ultrablock. It showed somewhat less than the O111, but the views were often far more pleasing. I now keep the O111 mainly for the tough planetaries.
Renato