Slim Devices Squeezebox

Hi all, Just bought my first Squeezebox 3 (and first post on forum) I’m absolutely thrilled by it. But although not the most technically minded I do love good hifi, and I’m already interested in getting every last drop of performance from my Squeezebox.I've heard about changing the power supply and fitting an external DAC could someone suggest anything? Current system Creek amp & headphone amp Linn Genki cd player & monitor audio SE 20’s speakers

Cheers

Jez UK