Which is the most powerful fan less iMac that uses a CRT for the display?
It's hard to beat a fanless iPod and a set of fanless speakers for the power of great sound. I'm in love with my iPod HiFi and a Belkin Bluetooth receiver for when I don't want connect my iPod through headphone or dock connector.

It won't satisfy your CRT interest, but I suppose no answer can be perfect... ;-)