If you want waterproof Paramos the Velez Adventure trousers are the ones to go far. But I suspect that in some areas (particularly gritsone/sandstone areas) that they would wear through in no time. I have both the pants and the jacket which are great for walking, but I only wear the jacket when I’m on the bike; I wear Endura eVent tights and my Sombrio baggies over the top in winter. The pants would probably be good (if expensive) for commuting.
Warmth is more important than staying dry – being warm and damp (vicar) is uncomfortable; being cold and wet can be lethal.
