I've hiked from Walupt to Tieton river, LOTS of nice spots along the way. I favor stealth camping and near leave-no-trace style camping, so anywhere with trees and nearby water works for me.
Lost lake is supposed to be gorgeous too. If we choose a site anywhere in here, I'll probably pick a ~10 mile journey to reach it.
Edit: this whole area is at 5000+ elevation. In most years there is snow remaining in July, but PCTa and other sources are indicating a fast melt this year. And snow doesn't bother me that much anyway.