Welcome to the MountainBuzz forum. Be advised that this community is mostly Colorado, but does span the whole nation. You may have better luck finding local (to you) boaters on the boof.com forum (CA based).
I've paddled the SF American many times; started rafting it when I was five. Been quite a while since I've been back there since moving to CO a decade ago. Never been on the Trukee. Some of my favorite CA water is up north: Smith, Scott, Salmon, Trinity. However, I've not explored nearly enough of CA to have a good feel for what's "best."
"A witty saying proves nothing."
- Voltaire (1694-1778)