Can you recommend your favorite brand of heavyweight card stock? I'm looking for cardstock that's sturdy but not too heavy (ie. if you hold a corner of it the paper it stays upright, around 80lb or so?) but at a good price. I'd prefer to buy packs of colors instead of individual sheets. I've tried the Paper Company value packs at Joanns/Michaels but they're pretty flimsy. I like the weight of the DCWV stacks but they're pricey, even on sale. What do you use and where do you buy it?