i personally have always been a fan of moo. but the thing was confirmed when i recently received a card a friend though i would enjoy and after a few drops of water POP!! its gone. moo cards particularly the luxe cards are as indestructible as paper can be.
check out this video: your business card is crap.
http://youtu.be/4YBxeDN4tbkthe best advice i have ever hard on business cards is from him: your card should be so good that even if they dont like you they wont throw it out. :)
my cards are meant to be kept. you cant tear it up if you wanted it. they have to be cut. :)
i use the moo luxe cards. they are 6x times as thick vista print cards and 3x as thick as regular moo cards which are already some of the best cards out there. i use the luxe cards as thank you cards as well since you can write on them without any damage or pen dents on the back of the card.
http://us.moo.com/products/luxe/business-cards.html