Ok, I got a set up of the following, so I want to add reviews:
Modiano: recommended; these are nice cards, they shuffle very well; nice back designs. Also, they use a lot of blues in their court cards, even on the hearts and diamonds, I think it looks good.
Fourneir (Spain): recommended; nice cards, on par with A+ and Modiano, maybe even the best of the three as far as feel and shuffle. The only criticism I could give is that they tried to give the court cards flesh colored faces, and I don't think it works all that great.
NPT (ace of spades reads: "Long Life Player's Cards"): these are ok, but not as good as A+, Modiano, or Fournier. A little be harder to shuffle than the three mentioned.
Royal (Taiwan): by far the least expensive of all the plastic decks (at around $5 each). They are ok, but they have a very slick gloss feel to them. This makes them "stick" a bit to your finger during the pitch. If you are just a home game (vs. professionally trained) dealer it probably wouldn't be a problem, however. Another nice thing is that the decks all come with individual plastic carry cases, something I have only been able to find with Kems (usually the carry case if for two decks together, know as a 'set up'). I am just using the cases for the other brands!
Summary:
Recommeded:
1. Kem. But only if you don't get a bad deck that is bowed, or an older (pre US Playing Card's purchase of Kem brand) deck that is defective.
2. Fournier.
3. (tie) A+
3. (tie) Modiano
4. Copag-- could be three (tie), or maybe even two (based on shuffablility alone), but I am going to give the other brands a slight edge because of looks/print faces. Also, Copag is so common that everyone has them, and who wants to be like everyone else, right?
Not recommended (mostly based on professional riffle/shuffle and pitch only; these would probably all be fine durable cards for home games, etc.);
1. NPT
2. Royal
3. Gemaco
4. Del Negro
Of course these are just my opinions, everyone will have their own idea of the aesthetic of the court cards, the feel of the decks regarding texture and stiffness, etc.