Berkeley late Sunday evening?
Is it impossible to do a pre-show dinner? Because you would *love* Gather, which is walking distance from the Rep. They do the exact sort of premium sourcing and menu transparency you are often seeking, and the food is wonderful, but they close at 10.
If it must be post-show, then I think Sea Salt is your best option (assuming you aren't BARTing). Cesar and Bobby G's are fine late night options that are walkable from the Rep. I don't know if I'd describe any of them as anticipation worthy, but the food is good, and Berkeley isn't exactly a late-night dining town.
2512 San Pablo Avenue, Berkeley, CA 94702
Those 2 plus this update from earlier Lauriston post.
Lanesplitter serves its full menu till midnight, slices and salads till 1am.
Cesar's kitchen is open till 11.
Fonda Solana has a short bar menu till closing (12:30).
Luka's Taproom has a short bar menu till midnight.
2221 Broadway, Oakland, CA 94612