Sea to Summit makes nice "dry bags"
I don't like the pyramid shelters for wind so I would recommend a Rab sil shelter, or an affordable option that I use is the MountainSmith Mountain Shelter
. I spent 3 days in rain, hail and snow in that bad boy and stayed dry.
Agree on Marmot, top notch gear and company. I love down and the new "Dry Down" definitely works but if you are doing fringe or rainy season multi-days a soaked bag is the worst (happened with non-dry down in the Selkirks in Feb one year). If you do go down I really love my Sea to Summit bag and they make some stellar small volume bags
. The one I have unzips in a way that allows it to be used as a quilt or blanket for warmer nights.
Stove: I prefer standalone canister stoves over Jetboil (or -like) systems. MSR makes some nice lightweight options that then can be used with different sized pots based upon the size of your crew.
I am still trying to find a good pad myself but a inflatable meets the volume issues you will have.
Best of luck.