What's the best brand of playing cards for deck fans?

KEM or Copaque cards are the best. They are the ones used in the casinos for poker events. If they get dirty you can wash them.

Yes I would agree that KEM or Copaque cards are the best. I've been in the industry for over 10 years.

http://www.custom-playing-cardss.com

Yes there are several sites that offer custom playing cards and claim to have 300 GSM coated stock. I would suggest obtaining samples from the companies before placing an order. I have ordered from this company before and was VERY satisfied, you can view their page here. http://www.customplayingcardss.com or http://customplayingcardss.com/custom_playing_cards

It depends on the coating of the cards as well as the substrate.

The best would probably be plastic cards with a really tailored card finish.

My friends have ordered card from Palaimon Cards and their paper decks were amazing to shuffle and just overall card feel

I'm ordering the plastic ones myself.

take a look at their site for custom personalized playing cards http://www.palaimoncards.com

Ad Magic offers quick turnaround with custom playing cards, personalized playing cards with quality comparable to customized bicycle playing cards.
Visit http://www.admagic.com/custom_playing_cards.html

The best decks are 100 percent plastic decks made of pvc and these are completely waterproof. The next best playing cards are 300 gsm or measure out to be about 12 mil when using a micrometer. These are know as plastic coated decks and have a carbon paper center so that they cannot be seen through even when holding them up to a light. Both types can be fully customized with a logo - photo or design. Some players and organizations running tournaments like to use their own imprinted cards. Cards can be ordered through many online sites such as http://www.admagic.com or http://www.admagic.org or http://www.customizedbicycleplayingcards.com