The reason I leave disc brakes alone is because if anything goes wrong with them I have no idea how to fix them. Block brakes have worked on all gradients for years and are easy to fix.
Saddles are a law unto themselves and are as varied as arses. I have Brookes on my bikes and Jannie can ride for hours on any saddle. The price has no relation to comfort. Nobody can tell you what saddle to use, you have to find your own. I found my favourite saddle by accident. Its a Ladies Brookes.
I agree with Vickster about waterproofs. If the rain doesnt get you wet then sweat will. The trick is to be damp and warm. I have both
Altura and Endura waterproofs. Both get great write ups but even with the vent's open, I get wet from within. I took a pair of scissors to my waterproof trousers between the knee and ankle and it is so much better and I dont get cold.