A small/torso pad is worth mulling over, but equally fine to NOT choose it. What's worth more, a few ounces on your back or a good night's sleep? Pad and Bag, perhaps more than anything else, are worth making weight sacrifices for IMO. Maybe you learn you can get by, maybe you can't.
Lately I've been using my LightLoad towel to do everything I did with a bandana. It absorbs more water, rings out better, and dries faster. I'm a bit concerned about the durability, but at $2 a pop, I'm willing to live with it.
"Pretty breathable" is a questionable term from reviews. Some say GoreTex is "pretty breathable" but I'd never want to use a GoreTex jacket at 40-50º! A good wind jacket is a UL hiker's dream for warmth on the move.
As you know, AquaMira is questionable. Some are fine to live with that, but others carry a second filter. I love my SteriPEN for fresh natural tasting water - I can taste all the chemicals and I stay better hydrated without them. You need to decide what works best for you, after a certain point of reading you'll find there are several good choices.