Upgrade PS for Peachtree Audio DAC-it x

I'm thinking about upgrading the stock PS for my Peachtree Audio DAC-it .  Can folks on the forum
possibly suggest an appropriate, safe and current option? 

The folks at Peachtree Audio let me know that the DAC-iTx
has the following power supply requirements:

Regulated, 9V power supply, 1.0 A
2.1mm positive center tip