I agree... I like Portland State to pull the upset, but I'm drooling even more over the +11.0.
They've only lost 2 games this year by more points... lost once to Weber St. (the class of their conference) by 14 and lost at Baylor by 13 (Baylor was ranked at the time). As has already been noted, they won at Gonzaga and nearly won at Washington (they hit a last second "worthless" 3-ball to cut the deficit to 1, but even a 4 point loss at Washington would've been a very quality showing). Jon Brockman, the Huskies best forward, sat out that game with a bum ankle, but either way you size it up it was a solid performance.
I also like how the Vikings have a slight regional advantage by playing in Idaho. I highly doubt Xavier will pack the house in Idaho. Should be a fairly balanced/neutral crowd and I think if Portland State can shoot 38+% from deep they'll have a good chance of winning outright.