Amplifier suggestions

The Linn 5125 only weighs in a 11lbs. How is this possible for 125w x 5

Linn uses (an excellent) switch mode power supply, thus no need for the massively heavy torroidal power supplies you find in most higher end amps. (Dynavector also uses a switch mode power supply in their gear that may be even better than Linn's.)

Some people are psychologically attached to massive amps. I personally am not - what matters is how the thing sounds. I also actually prefer my audio gear to be manageable in size. It makes placement more flexible, makes it much easier to work with (e.g., switching out components for A/B's), and has much higher WAF. I don't think I would have a prayer of having my gear in the living room if I were using something like Levinson or Krell.

I am currently using a Sherbourn 7/2100 which is 7x200 into 8 ohms and I believe 300 into 4 ohms. Running this into my Dali Euphonia MS4's and I can tell you that the Sherbourn never runs out of gas. Sound quality is quite excellent and probably one of the best values for the money on the market for a multi channel. At full retail new they are around 3k. You should be able to get a good deal on a used one around $1700-1900.

Best of luck in your quest.