I've enjoyed reading this, so I'll join in. I wanted a digital source that reflected the trend of streaming music. I started with an iPod Touch, but decided that was neither very modern anymore nor cost-effective. I turned to the Chromecast Audio which has a built-in DAC, but to add flexibility for other sources, like a laptop, I selected a well-reviewed external DAC. I really like my floor standing Wharfedales, so I chose a bookshelf option for this system. This left very little budget for the amplifier, but the TPA3116-based amplifiers are well-regarded elsewhere on AK.
Chromecast Audio, Google Store, $35
Schiit Modi 2 Uber DAC, Schiit, $149
Nobsound TPA3116 dual chip amplifier, ebay, $32
Wharfedale Diamond 10.1 speakers, Amazon, $249
FosPower mini toslink cable, Amazon, $7
Monoprice RCA cable, Amazon, $5.50
Siker 19V 4.7A AC power adapter for the amplifier, Amazon, $14
Speaker wire, Amazon, $8.50
Total: $500