I think you should be confortable down to 0 degrees with that system WITHOUT the front point down jacket. 2 layers of down is for some seriously cold temps. You should leave the front point at home and get a gore shell. The "wet" part of your conditions pretty much mandate it. You could also forego this jacket as a layer and just keep your front point in the pack for when you're sedentary, but if you want to wear a down layer all the time this is probably the right jacket. Clear as mud? Here's my system YMMV: Base: short sleeve polypro, long sleeve patagonia zip neck polypro (thin kind with a silverish reflective fabric), Marmot Leadville softshell jacket with gore windstopper, OR Mentor jacket with gore pro-shell and this jacket as my down layer. This jacket will usually be worn over my gore shell (when I stop to rest), but if it's butt cold I'll go ahead and put it underneath the gore shell and keep it on all day. This system keeps me comfortable easily to zero degrees (actual temp NOT windchill), and the windstopper and gore layers prevent any other windchill issues. If it's gonna be below zero I'll substitute this jacket out for my Mountain Hardwear Phantom jacket, which is much loftier but about 3/4 lb. heavier.

That system seems overkill for temp with a wind chill of 0 degrees. I use wool base layer, heavyweight fleece, and gore-tex shell and that is plenty. When you stop to rest, it would be appropriate to use the ul down jacket.