Here, or ISG. There's a major distinguishing factor for maximizing your potential, and that's how well you know Japanese, for two reasons:
First, there's all kinds of information available about mongering in Japan if you can read Japanese.
韓国デリヘル カンデリ生写真館 ～パネマジを吹っ飛ばせ！～ and
AV are two examples of that.
Second, the number of "legit" places in Japan that both service foreigners with no Japanese ability, and aren't a total ripoff I can count on one hand. Most of the reviews for places that service foreigners are going to be for the same places:
Asian Mystique (Japanese outcall delivery- deriheru), Hipness (Thai/Filipina deriheru), Hinomaru and Ichigo, which are pink salons (BJ bars), and then the other occasional rub and tug place (such as Asian Feeling), or massage place that provides FS (like Himawari), and you have soaplands which arguably will provide service for non-JP speakers, but they don't exactly cater to them.
There's other places that I see discussion of occasionally like Club Boo or Nasty Dolls or what have you, but those places are some combination of so rarely discussed anywhere and/or don't update their website and/or overpriced that I don't lump them into the category of mainstream foreigner friendly providers.
In between these and the Japanese sex shops that are absolutely NOT foreigner friendly are other places that are happy to service foreigners if they speak Japanese, or deriheru places where the org might care, but the girl doesn't.
Now, I've found in the few years of my hobbying career that there are some cases where a provider goes unreviewed because guys like to keep a good thing to themselves- it keeps prices down, and scheduling remains pretty easy. That goes double for mongering in Japan, where it's not just a high-quality provider they want to protect, but also whether the org will continue to allow foreigners. There's been lots of cases where someone posts a review on a new place that was foreigner friendly, and a bunch of idiots go in there with no Japanese or no respect for the Japanese way of doing business, or treats the provider like crap, and that shop all of a sudden no longer allows foreigners.
It's a generalization, but it only requires one asshole to ruin it for everyone else. If you look at the bottom of TAG's front page, you'll see probably that guests are 10x the number of registered users, and there's probably a similar multiplier effect on other boards out there. I'm not saying that all guests are assholes -- hello to all the non-contributors out there! -- just that the 'community' that we are writing reviews for isn't just the registered users you interact with regularly here and on other boards, but for the consumption for everyone else that anonymously uses review boards for intel as well.
Hence, I'm sure there's quite a few places out there that are foreigner friendly, both for Japanese speakers and non-JP speakers, that people don't post reviews about, and a big part of that is that they don't want that shop closed to them in the future. I don't think there's really a solution for this, other than sharing information among 'valued contributors'. As long as current conditions last in Japan -- that is, it stays a somewhat racist society, a somewhat rule-based society, and P4P clubs remain in the grey zone of the law -- you aren't going to see a bunch of high quality, decent priced shops available for foreigners.
Sorry for the rant.
I get frustrated by the lack of intel, as well, but my solution is basically to work on my Japanese to the point where I don't need to worry about English language intel -- it's not there yet, unfortunately.
