You can't go wrong with a pre-ceramic Submariner, money in the bank. Their value is going up all the time. There's a few watches that are super solid investments like steel Subs. They're just great watches too. Not so pricey that you are afraid to wear daily and scratch or damage, great looks and quality.
My first Sub was destroyed in my motorcycle crash, and I finally was able to replace it. Just brought this new one home yesterday, an M series Date Sub.