Kems are nice. They are thin, which makes them easy to shufle, but makes some people think they are flimsy.
Copags are nice, and have beautiful backs, but the colors are less briliant than other decks.
I use Desjgn cards in my home game, perhaps since they were designed by my good friend Jason, but also because they have beautiful court cards and pip placements (which I admit are not for everyone).
At less than $8 per deck, they are also a real bargain in plastic cards.
http://stores.ebay.com/Desjgn-Playing-Cards