"Dynamic Rangers" sounds like "Power Rangers" to me. I'm not wearing turquoise lycra for anybody... More seriously, if it encourages HDR in any form I'm agin' it.
Honestly, the name is, to me at least, incidental to the focus of the site. Having slept on it I'm going to vote - again - for Serious+Compacts - close for SEO purposes, close for mission purposes.
In the UK at least, "rebranding" is often seen in a negative light. We should be wary of the messages we send, and careful what we wish for.
A short story - back in the 90's I worked for a very successful company with a strong culture with some unique elements. There was an initiative at one point to analyse that culture, to codify it, and set it down on paper. I was one of those that argued "culture" simply = "people". The effort to codify was abandoned, and the decision was taken to simply go on recruiting like-minded people. A few years later the very successful company acquired a less successful company of similar size. The culture was heavily diluted as a result. Good people became disenchanted and left. 18 months later it was subject to a hostile takeover and today it is no more.