AbdalQadir was doing some weird stuff involving Hitlerism in the 70's and 80's but it seems like he straightened out since.
Nuh Ha Meem Keller was doing great work in years past, now former students say his compound in Jordan is a full on cult. Check him out for yourself though.
If you go to most mosques, especially desi ones you could get involved with tableeghi jamaat. I've spent a lot of time with them, they're definitely legit.
Some wellknown and transparent/respected sufi orgs are in California led by Hamza Yusuf and Habib ali Jifri's middleeastern projects. Also, you should contact Timothy Winter (Abdal Hakim Murad) on twitter. Sheikh Abdal Hakim might answer you, I imagine. You could also try to contact Mohammed Ghilan on twitter or even Zaid Shakir.