I've used Oceanic CDX-5 coupled with an aqualung LX supreme 2nd stage and the aqualung glacia on several ice dives and numerous deep dives in 37F water without any hick-ups. I also did a big no-no and breathed the glacia on the surface...still, did not have a free flow.
At any rate, this doesn't really help you if you have the aqualung titan reg. but if you were looking at buying other regs, i'm recommending those because I've had positive experience with them. The nice thing about CDX-5 is that scubatoys has it for $144, environmentally-sealed with DIN. Of course, you would have to use something else in place of the Alpha 8 second stage, as this 2nd is not designed for cold water.
Just my 2 cents. Good luck.