Why not CD-3mkII? It is better than what you're talking about upgrading to.
Which CD would you recommend?
Thinking of changing my ARC CD-2 to maybe a Sim Equinox SE or Marantz SA-15. Any thoughts which might be better if I did change? (See my system for equipment). Not dissatisfifed with ARC but do have the bug to change, only thing that bothers me is the break in time (Sim says 300 hrs, don't know what the Marantz takes). Thanks your thoughts would be a help.