FnF is dope. Muay Thai-wise, you got Bunkerd (who was the head trainer for Fairtex here in the US) and Neungsiam (current Muay Thai WBO lightweight champ)
MMA wise Chris Cariaso (Strikeforce) and Luke Stewart are both trainers there as well.
Darren Uyenoyama used to be the jiu-jitsu coach there too, but he opened up his own gym in DC.
Cool ass people, old school gym feel. I've trained at 3rd Street also, for a bit.
Its like a family atmosphere, everybody is hella cool, from the members to the staff. Definitely worth checking out.