I don't know model names, but the dry lock is excel's top of the line suit with bomber seams. Look at a model a price point below.
The RipCurl ebomb is their entry level suit. It is blind stitched (I think) and has tape below the waist and at "critical points". Or where three panels come together. Anyway, I use it in 54F and above (assume sunny, slight wind, and 60F plus air). and have no complaints regarding warmth. I use my hooded R3 for colder days.
Point being, spend your cash on a nice warm suit for the cold days, and get something a little cheaper to fit between that suit and your 3/2.