I would reccomend Atomic Aquatics T2x Regulator or M1
Atomic regs are great breathers, but the seat saving orifice design in the second stage means that the hoses and first stage can flood if you use them in technical diving applications where you may leave the regulator uncharged (such as stage bottles). This is something to be aware of, as depending on which agency you use for your training, you may be trained to leave your stage bottles off and your regulators uncharged during your dives.