I might wait till after the UW game this weekend but I wouldn't wait past that. I know Cal is pretty sucky, they've been flat out garbage on the road, but they've been fairly stout at home. And Cal's defense could...COULD, challenge Oregon. I don't see them beating Oregon, but there's the possibility. Also, and I highly doubt this will happen either, but they could catch Oregon looking past them to Arizona. Really, $450 bucks has to be well more than double a piece, I'd just put em now or maybe wait till after the UW game.
If you wanna be ballsy though, you could wait till after Oregon's game with Cal game and after Oregon State's game with Wazzu. They will most likely both win this week and next week, but I highly doubt State can handle SC, and surely not Stanford.