GR-Research, Danny, has a very good reputation and offers excellent support. So, you cannot go wrong staying with his products especially for dedicated home theater.
But, since you are looking for subjective opinions:
If I was focused on music or 50/50, I would pay the difference for the Ellis 1801b kit.
I have listened to Darren Thomas' AV1+ with the Sonicap upgrade. The 1801s have much greater detail, articulation, imaging and better bass extension. The AV1+ are more efficient and agreeable with recordings that are mixed very bright/hot. Although, the 1801b crossover upgrade is supposed to make the OW1 more palatable as well with hot recordings.
It's a different experience. The 1801s draw a clearer picture of the music.
If you are on a budget and your focus is HT, I would go with AV2s all around.
Although, I would also give strong consideration to Dennis Murphy's Usher 2-way ... about $350/kit.
http://murphyblaster.com/content.php?f=usher2way.htmlhttp://www.madisound.com/cgi-bin/discuss.cgi?read=261215Hope that helps,
Al