I like the colors and prefer Entry #3. It looks professional and expensive, however I'd like to see the "education" element tied into the logo more because ultimately the product is an intense education event. Maybe a graduation cap or other symbolic references to elite education?
Would it be possible to expand on #3 and move the words Domain Academy over to the right with the DA on the left? Also you can take out the tagline "2 day immersion bootcamp" from underneath. Maybe include a variation that is 3D that makes it pop out more?
I'd also like to see it with a small, black graduation cap maybe hanging off the DA portion?
#24 is interesting however the words will need to line up with each other on the right hand side. I believe the font/letters should be bigger for "Domain Academy" Also, can you remove the tagline?