I currently own Linn Unidisk SC. I have previously owned Meridian G68 and Proceed AVP2+6. They are all very musical. You should be able to put together musically satisfying system with any of these.
I like Unidisk simply because of its superb SACD performance. When playing SACD the background noise is so low you can hear and feel the recorded ambiance on many of the recordings. The redbook CD performance is also pretty good. Meridian was probably a touch more smooth and airy in redbook CD and DVD Audio, but the difference was small enough. Proceed sounds fuller and more authoritative compared to both Meridian and Linn. Proceed, while it was a very good processor, was tad dark sounding, and ultimately I preferred more lively and airy sound of Meridian and Linn.