CHAP, from American Crafts is my favorite line- it's discontinued and getting harder to find, but the papers are so so great!
And then I guess it can come down to the guy or page you're trying to scrap for- Cosmo Cricket's SOCIAL CLUB had some great papers, October Afternoon's BOARDING PASS is another of my biggest favorites- I love its retro cool travel them. Very very cool.
And of course, Graphic45's A Proper Gentleman.
-kory