I decided to get the 250gsm undersuit for my Nova in the end. Also added the Tech Base top & pants, as well as some other goodies, including the SiTech Glove Lock system. I figured I can cover medium temps with some Polartec fleece over the Tech Base or some other base layer (water was 51-53 ºF here last weekend and I was comfy) The 250 should be good for winter diving around here. I'm shipping to UK and hoping pick the stuff up when vising family and friends in Europe over Christmas/NYE to avoid extra shipping and customs fees on clothing.