If you are looking for flats fishing i would reccomend Abbie Marin. he has a company called "Go Fish Belize" that he runs with his father Carlos Marin. i fished with him last april and he was spot on. caught bone fish, permit, jacks, cuda's, reef fish and jumped a tarpon. almost all on the fly. he also does inshore reef and offshore fishing as well but i did not persue that route.
let me know if you want any more info.
I am so envious.. I love Belize. I have fished and dove with an outfit called Capt. Rons. I didn't really think the fishing was worth the money with them (reef fishing). The diving was a great experience and I loved the crew there. (Mr. Big and Chet) In all fairness, I think they just call someone in to take you fishing and it isn't their bread and butter. The are right in front of the new Phoenix condos.
Not much help I know, but, maybe you can avoid them for your fishing needs.