Phislet
If you are wondering about whether a certain reg can handle the cold conditions you may put it through, you are at the right time of year to really find out. I'm not sure what Michigan is doing temperature wise right now, but Lake Ontario (at least where I have been), has been hovering around 39 F (~4C)
I'm not sure of your experience/training level, so take this next bit with a grain of salt, but if you can do so safely, and with a buddy you trust, you might want to try out some of the regs you are considering. The key here is safety, since you will using a reg that you are unfamiliar with in cold conditions. Don't put yourself in conditions beyond you capability just to try out a reg.