You gotta love #300. That is something that is very similar to an idea I had swirling around in my head, influenced by a logo that a cavern nearby where I grew up had from the 70s.
I think the type in #299 is pretty cool, so I would experiment with using that but with a more simple graphic variation on the concentric circles (less circles, or less maybe "tighten" them up so they are not leaving the boundary of the design as much.) I like it the FEEL of them, but the design is just a little bit too busy.
I am not interested in the double C designs as much. Digging the more abstract stuff now. Thanks a lot for these, and for trying out the text like I asked for #290 and #300.