nVitiusStock earpads are cheap pleather. I hate them!
Audio Technica's HP-L3000 are the best, made of genuine Italian lambskin.
But they are quite rare and fairly expensive.
JMoney beyer pads are really good, they were about $55 shipped (CONUS).
You could settle for the W5000 pads, they are better than stock but not as comfy as the L3000.
Can get them off ebay for less than $80 shipped (INTL), which is still way overprices :(
I got two sets of the W1000X, and tried almost any pad that would fit them.
Using L3000 pads for the main set, and JMoney when I'm at work.
I like the L3000 better, but no way in hell they're worth it at 100 bucks.
(Bought mine in Japan for less than $40)