The CD555 is about the same vintage as the CD12 and presumably they were going after the same high-end audiophile market. Production stopped a few years ago but unlike Linn, Naim have put aside spare mechanisms for each player built. They also have a better pedigree when it comes to supporting their older kit, in fact I’m still running a 40 year old power amp on one of my setups, which just needs a recap every decade or so. Not to knock Linn, who make some absolutely superb kit and who themselves have transformed old LP12s with great upgrades over recent years (Keel, Urika, Karousel etc.)
In your scenario porcy I would recommend a really good streamer with NAS drive etc. One thing I really do like about CD is no faffing about and I find these days I use it more than the turntable, strangely enough.