Right up my alley!
I haven't tried Monsieur Carven, but...
Patou Pour Homme is my favorite fragrance. It's a thick, dense, yet refined and pleasant masculine oriental that has an unparalleled uniqueness and classiness to it. It's strong, but conserved and elegant.
Balenciaga Pour Homme is in my top ten. It, too, is an oriental, however more on the sweet-aldehydic side with incense, cinnamon, aldehydes, and an apple-pie like note sticking out. Balenciaga Pour Homme is definitely classy, but more of a traditional powerhouse than Patou Pour Homme is.
As for Monsieur Carven, if I remember correctly, fellow Basenoter AromiErotici loves the stuff. I'd ask him.
Balenciaga Pour Homme can still be found online (like eBay, xmen's sales thread, and decants at The Perfumed Court), but is getting rarer. Patou Pour Homme, on the other hand, is probably the most sought-after masculine fragrance out there. There's very little left of it on Earth, and full-sized bottles usually go for $1000 or more when they are for sale.