http://www.yelp.com/biz/beni-tora-los-angeles-3
A second to greggman's rec of Tsujita, as well. They have excellent tsukemen (dipping ramen). Across the street, their second location, Tsujita Annex, has really good tsukemen and their ramen is excellent too, if ridiculously filling.
First it's tonkotsu(豚骨). not trying to be snarky. Just passing on info. But second, at least in my experience, all tonkotsu in LA sucks except Tsujita. And even Tsujita sucks unless you get their tsukemen or as they call them "dipping noodles".
Or course everything in food is subjective. I like extremely rich flavorful noodles. Some people like light flavors.
As for tantanmen, apparently real tantanmen (if you can call any food real) is the Chinese kind where there's a thick oily spice sauce at the bottom of the bowl and you have to stir it up. In other words there's no soup.
In Japan there's another style of tantanmen which is has a soup broth. As usual there's a wide variety from light to heavy. The light stuff is not for me but the heavy stuff is AMAZING!!!!
http://i.imgur.com/NzBzAdN.jpg
This is from a chain called 万豚記 (wan-zhu-ji) (memory of ten thousand pigs). It's owned by a corporation that has a zillion restaurants in Japan.
http://kiwa-group.co.jp/brand_search.php
many of them carry this style of heavy tantanmen which I love
Oh, yes. The Chinese word is dandanmian, though, and most English-language menus will write it as "dan dan noodles" (and I've seen it written as "dong dong noodles", too).
Where I live (Dallas suburbs), there's one really amazing authentic Sichuan place -- Royal Sichuan -- which serves actual, authentic dandanmian, and it's some of the best food I've ever had in my life. I can't get enough of it.
I've been there and Silverlake Ramen was better. You can probably find more gems around Gardena/Torrance.
Tsujita was the only one that tasted anything like the kinds I like in Tokyo.
That only makes it better for me though. People like what they like. If you like Sliverlake more power to you. But it's nothing like ramen in Japan.