Mat recommendations for a Rega RP1

Just bought a Rega PR1 turntable. Any recommendations for an after-market turntable mat?
Herbie's Audio Labs.
I like Herbie's mat as well, but why don't you just listen to the table for a few months while everything breaks in. Then you'll know if the new mat is an improvement or not. Don't assume that changing the mat will improve the sound to your liking.