Get a switchable remap (like Revo / Superchips etc.), and if it causes you any problems in the winter months then just dial it back to standard whilst the weather is getting in the way. Best of both worlds, but do some research on mapping agents as some maps are more aggressive than others, and some are better supported than others.
Remaps will strain the cars ancilliaries a bit harder, and can show up faults you wouldn't have realised were there pre-remap, so having a good dealer behind you who is fairly local, and you have confidence thay they can help out with any little niggles makes life a LOT easier!