As far as brass goes, LC is pretty consistent and Wes sells fully processed pieces so no swage needed. Just load and shoot
For dies, I don’t run anything that high speed but I tend to do all my brass prep first so that’s taken care of. Give Mighty Armory’s sizing die a look. They’ve been known to make great stuff.
https://www.mightyarmory.com/
I have Lee for 90% of my dies but I think you can’t go wrong with any set you choose
For primers I just get whats available to me and work loads for that. If it’s for plinking and I’m shooting moderately light charges I may use other primers for that load with little change. 51s have a harder cup and are meant for service rifle but I’ve never had issues with CCI400s or WSRP personally. But I’m not sure if Dillon has primers you can/can’t use in the press
If I missed anything feel free to ask [emoji16]
And if brass prep becomes a chore check out a giraud tri-way trimmer. It saves hours on brass prep especially if you’re running large batches