Poseiden makes terrific regulators that would be my first choice for cold water diving except that they are a <insert expletive> to service and keep tuned and hard to find qualified technicians for. When you can find it, service often costs more than for other regulators because of the amount of time required and the money you'll spend on parts kits could feed a small Caribbean nation.
In order of personal preference for cold water diving, then: anything Apeks, the Aqualung Supremes (both Titan and Legend) and Sherwood Blizzard are the best choices. Though I own (and like) several ScubaPro regulators, I won't use them in really cold water - the general concensus is that they freeze up too easily, certainly that has been my experience.
I own a number of various Apeks and a couple of Legends that have repeatedly been well below your 200ft benchmark in very cold water without trouble. I'd be willing to take a Poseiden to the deep (but haven't) and I wouldn't use the Blizzard and the Titan for anything below recreational depths.
Smart move staying away from the FFM, at least for now. They have their place but they present a set of challenges that new divers don't need to be dealing with, especially in cold water, especially at depth.