No recommendation per your request but I do occasionally see people selling Mac Minis that are fully set up as audio servers. I see them on this site as well as a couple other sites.
Mac mini you don't need a laptop plus the mac mini is so quiet, has more ports to work with. You really don't need the portable functionality of a laptop when it is going to sit on your rack.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.