@sk1lldI've tried a lot of them and my favorite by a lot is the X-Raypad Aqua Control 2. I like anything that's a cordura like fabric. My hands tend to be slightly sweaty, so if you're like me at all, I highly recommend it. I also use a little fan for my mouse hand as well.
It has low initial friction, and very consistent glide. The other thing that I really like is that it doesn't seem to slow down much or get a dead spot. Every fabric pad like the qck has developed a dead spot in the middle, and only after a few weeks of using it.
Make sure to use some decent feet for your mouse as well. Leathal gaming gear carries the Core pads that great and pretty cheap.
Cooler Master makes the MP511 that's pretty good as well, but feels slightly harsher on your hand. The Aqua pad has more sizes available, and I personally use the 19x19".
Boardzy is currently the most active reviewer I'd trust with their opinion regarding mice and pads if you need a resource for reviews.