I've been jumping around with a few varieties of watercolor paper.
One that I like a lot is Arches hot press watercolor board . It's more expensive than my standard love, Strathmore 500 imperial. Maybe the fact that it's more expensive helps focus my work in a way... "Shoot, I only have two more sheets of this!"
I haven't tried it with a big wet painting yet.
Thick originals are nice too with a board like this.