Check out AddHelium.com and if possible visit their showroom in Pompano Beach Fl! Since you are an OC diver, you will get the most unbiased informational experience since they do not just specialize in one or two but in twelve or more rebreathers.

They also offer everything from your initial rebreather course to CCR normoxic, CCR trimix,CCR wreck and CCR cave. Cave training has been and can be held in Mexico.

Cheers and have fun!

Claudia