To answer your question more directly, I'm a big fan of Red Light District too as you can see from my screen name.
Anabolic (and their sister company Diabolic) was like the Red Light District of a few years ago. They had lots of gonzo series of similar content and quality, a good lineup of directors, and cranked out a lot of product. Now a lot of these directors have left for other companies and Anabolic/Diabolic is not as big as it used to be. Chico Wang is still there, and I like the stuff I've seen from them that he shoots.
Anarchy Films is much more hit-and-miss. I've seen movies I've really liked from them, and some that truly sucked. The sex does not seem to be as hard-core as in RLD releases. I would not recommend the company as a substitute for Red Light District.
Some studios I would take a look at, and would say that they're similar in content and style to RLD:
Platinum X Pictures
Zero Tolerance
3rd Degree
Devil's Films
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