get your training where you plan to dive.. If you plan on doing deep trimix dives in low viz, you should train there.. Its not a good idea to do dives that are considerably harder than your training without building up experience.. that being said, If you plan on warm water deep dives, I can recommend Erika or Reg at sunsethouse in Grand Cayman both were former national directors for IANTD canada... The conditions are ideal for doing easy deep dives (many done from shore the wall is only about 300-350 yards or so from shore), but remeber it doesn't qualify you to dives that are more difficult than your training..
I recently got back from Truk and did a series of deep air dives on a rebreather (no He available and infact my N2 is greater than that of OC Air diver beyond about 170), many 200ish that were quite easy, in all I did at least 25 deeper than 150, doing 150ish in limited viz and cold even using trimix can be a challenge..
