I don't think Portland and Washington are very good trading partners, so lets ignore that. Not making salaries work or any of that.
What package of players on Portland do you think is worth the value of Caron Butler?
Personally I think it's something close to Outlaw + Blake + Rodrigez. I'm not sure I'd be willing to do that trade, since we'd be down to one PG, but still, I think it get's pretty clsoe to Butlers value.