There will be phase response issues with a pair of speakers for a center channel. Go with the HTM1, it is clearly better than the HTM2, which is an 805 in a different box. What possible reasons point to the pair of 805s?
What Nautilus speakers are you using for your front L+R? A third one of whatever you are using would be ideal but unless you have a perforated screen it probably wouldn't be practical.
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