i've had both - a caps type server and mac mini. i'm currently using a late 2009 mac mini (SSD, 8 gigs of memory... the empirical audio site has some great info on this) with audirvana and it's the best sounding computer playback i've yet attained.
CAPS 3.0 Zuma vs Mac Mini
I've narrowed my voices to one of these two. Both look like they could do a great job and sound exceptional. At this time I could not use the Mini as I'm running jRiver ( I know there is a MAC version forthcoming). I'd probably run either with 16 gig of RAM, linear PSU, solid state drive, Ethernet for bridge, top of line Intel i7 processor.
Any ideas would be welcome.
Any ideas would be welcome.