Bones,
I have some fair comments to offer. Your questions are good.
"Any opinions of how well these speakers would function in a Home Theater? "
I think they would do just fine. Marsh makes a good head-unit, and the Anthem isn't bad. I am too cheap for this stuff though. I use the 1801's in stereo with movies. Getting good surround sound equipment is commensurately expensive. I believe that 6 channels of sound can be equal in quality to 2 channels of sound. But, this equivalent quality will cost about 3x$.
Also, Dennis Murphy recently redesigned the MB-OW1 with the same phase and slope as the 1801. He claims they are darn close from 100hz up. These would make an excellent center/surround speaker.
"I'm sure a subwoofer would need to be made, and I'd take recommendations in that area as well. "
There are some comments about the SCC300 subwoofer in this circle. Do a search and you will find my comments. IMO, the SCC300 is a killer driver! Eventually I might be selling it in some configuration. At this point my subjective comments on the driver will cease.
Also, many guys think a subwoofer is "necessary" with the 1801. None of these guys who think it is "necessary" has heard the 1801. While it is true that there are a few guys who use a subwoofer, there are many more who don't. I have a subwoofer, but haven't used it for months. The intent of the 1801 was killer midrange with good bass to 40hz. It does this quite well. 40hz is below the lowest fundamental for any common instrument. The bass guitar has a low of 41.5hz.
"Is there any comparisons to B&W speakers? I'm fairly familar with them and would really be able to grasp how good these are if anyone could say something like "they are similar to the 803's or watever" "
Yes, Bill Hojnowski managed to a/b the 1801 with the Nautilus signature. His comments are at :
http://www.audioreview.com/Main,Speaker/Ellis,Audio,1801/PRD_125773_1594crx.aspxHopefully my comments are helpful.
Dave