what cd pioneer, marantz, meridian?

My CD player is Pioneer PDS-802, is really old stuff, is worth it to add a DAC and use the PDS-802 as a transport? I looked at some reviews and concerning Marantz CD17 M2 KI and CD6000KI signature the CD17 is very expensive as second hand and is difficult to find these stuff. Any suggestions for similar CDs, what about Meridian 506 24bit?
Thanks Williams