This may be too budget for you but from direct experience I can vouch for this Sony player.
Sony SCD-CE595 5-Disc CD/Super Audio CD Player
I used this CD/SACD player to break-in all sorts of cables and equipment. I would put in 5 different break-in or test CDs and have it play for days/weeks on end. It never had any problems.
When I wasn't using it as a break-in tool and just listened to music is was very nice. No harsh treble and a bit laid back overall.
I've read the Adcom multi-disc changers from yesteryear were also very good. I don't know of any current multi-disc changers though.
Sony SCD-CE595 5-Disc CD/Super Audio CD Player
I used this CD/SACD player to break-in all sorts of cables and equipment. I would put in 5 different break-in or test CDs and have it play for days/weeks on end. It never had any problems.
When I wasn't using it as a break-in tool and just listened to music is was very nice. No harsh treble and a bit laid back overall.
I've read the Adcom multi-disc changers from yesteryear were also very good. I don't know of any current multi-disc changers though.