I've had excellent luck with the razer goliathus, assuming you want a 'soft' mousepad.
I've had a few others but this has a few features that make it a decent choice.
The edges are stitched, so it won't split. This is a critical feature in terms of long term use. I've had lesser gaming mousepads have their top surface peel off.
You have two options for surfaces - If you're a twitch gamer, go for the slick surface of the speed varient, if you want more control (and I'm guessing from the relatively low DPI, you're a precision player) there's the control version. I've got both (on different systems) and I'm relatively happy with both.
There's multiple sizes (I went with large on the speed pad, small on the control version) to suit your playing style as well.