Thought perhaps we could use a thread for discussion of headphones, amplifiers, DACs, and all other audiophile thingamajigs. Please be respectful; no one is better than anyone else!

I have quite a selection, but I usually use my "Quick & Easy" setup:

Lenovo ThinkPad >
foobar2000 (lossless) >
AudioQuest Cinnamon USB cable (Mini to Standard) >
iBasso D7 Sidewinder DAC/Amp >
Sennheiser HD600 (w/ thicker cable upgrade)

So how about you guys? Headphones or speakers? Open or closed headphones? Preamps? Portable or Desktop setup? Tube or solid state amps? Do you like Little Dot, Schiit, something else?

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I'm also taking recommendations for desktop DACs around the $500 mark...