What is your budget? I could put together a killer system for cheap or expensive, like many here could. One DAC I highly recommend is the PS Audio Stellar Gaincell, you will need to look on the used market, USAudioMart.com. My buddy has one of his for sale up there right now, a black one. He has a few, as he loves the Gaincell that much. He is thinning his collection. I think he is around $900 shipped, Edman in Shelby MI.
On the cheap, and don’t laugh, the new Fosi ZD3 DAC/Preamp. I own one, and this stupid thing is beyond impressive for $179.
Streaming, well, you are on the PS Audio site, the AirLens @ $2000… I use the Volumio Rivo transport, I think I have $2000 invested in that one. Or, on the cheap, with incredibly good sound quality, especially when paired with the Fosi ZD3 DAC/Preamp, is the $329 WiiM Ultra, I own two. Just a solid and fantastic streamer, and preamplifier with a decent DAC, but not as good as the Fosi. Downside with the WiiM Ultra, it does not do Apple. Many folks use AppleTV to stream their music through an external DAC like the Fosi ZD3, which has an HDMI input. If you are heavy into Apple Music, and do not desire to have a subscription to say Amazon Music, Qobuz, Tidal, etc… The AppleTV may be your best choice. If you have Amazon Music, I would go with the WiiM Ultra. I have AppleTV, it works, but I have Amazon Music and Love the WiiM Ultra, they work incredibly well together and you get the HiRes if you use the USB output, and it does make a difference.
CD transports/players, lots of them out there, if you want SACD, PS Audio has you covered, but at a cost, as we do not know your budget. Many folks love the AudioLab units, Cambridge Audio too. They make dedicated transports and players at reasonable prices. They are on sale at Amazon right now, around $500. I would try streaming first before jumping into a CD player, unless you have huge CD library. Just me, I have pretty much dumped physical media with my streamers.
Amplifier, PS Audio has them… I like my ChiFi units, currently using a Dartzeel clone, the D5Pro found on AliExrpress, around $600 delivered, it sounds much better than my Parasound A23+. If you are on a budget, say around $300, you need to seriously give the 3e Audio A7 a series look. I have one hooked up to my Zu DW6 Supremes right now, and cannot believe this little amp is doing what it is doing for only $300 delivered. I cannot say it is doing anything wrong, and it is light years ahead of the other amps in this category, like the Fosi or Aiyima offerings.
Then speakers! Do you have any? Or something in mind? I would give Zu Audio a serious look, their DWX or DW6 speakers are an incredible deal, and sound fantastic for the money. they easily compete with speakers that cost double or triple the money. And, you can power them with a 9 volt battery, and are fantastic for low volume listening, I love mine, on my second pair. If you want an inexpensive pair of speakers that will knock your socks off, especially with that 3e A7 amplifier, check out the $250 NHT SuperZero 2.1’s. All I can say is OMG! Do not let their small size fool you, these little guys can fill a room with some incredible sound. Just add a sub, like the $299 RSL Speedwoofer 10E.
My other thoughts on speakers, if you are on a budget, stay away from Klipsch. They are more for home theater in their lower price range offerings. I would look at the Polk lineup, much better sound in my book. If you are spending a bit, look at the Zu’s, they will really open up a lot of possibilities for future gear purchases, especially tube amps. The sky is the limit on speakers, just get the best you can afford, or just grab those SuperZero’s, seriously, they are that good!
Good Luck! And I hope this helped. 