"Marine" foul weather gear has patches and reinforcement in different areas. For instance the butt on my foul weather pants is reinforced and has a coarser weave cloth that won't slip on seats too easily. They are cut higher in the waist, so my jacket overlaps by quite a bit. They are insulated a bit like ski pants, but not so much to make them too warm. They breath pretty well and are waterproof. They weren't that expensive, I think they cost me $100. The features are worth it compared to cheaper non-breathable rain pants like the Columbia ones you've mentioned.
I use jackets that I already have (living in Seattle means that I have a large supply of good waterproof jackets), but found it useful to buy proper foul weather pants.
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior