The most important link in the chain that most folks overlook- THEIR OWN EARS! The quality of your own hearing is vital in appreciating any music/equipment. Although we don’t like to admit it as we age our hearing like our eyesight degrades. The irony is that we usually have a bit more money to spend on our HiFi once the family have grown and flown the nest- just when everything starts to fall off, fall out and fall down…
SACD is a superb audiophile format. There are still new discs being released regularly and a healthy used market too. I have 1000+ SACDs in my collection. Of course like any vinyl album/cd a lot depends on the original source mater tapes- you can’t make a silk purse out of a sows ear! The sound quality of the best SACDs is EXCEPTIONAL! If you prefer physical discs then SACD is worth investing in. Marantz have several excellent SACD Players currently in their line up.
Leaving any equipment on continually is an accident waiting to happen. Sometimes even the fail safes fail. Ask the fire department in your town! It’s also burning cash- it all adds up over time- running your equipment continually for over 10 years!!!