I am using a Parasound Halo Integrated (160 wpc) to drive new Song3s. Same sensitivity as Song Towers, I think. Plenty of power, terrific sound stage though I am finding the Song3s sensitive to placement in order to maximize spatial imaging. Overall, I find the combination quite musical. The rest of the system is ERC-3 transport, internal DAC on the Halo, Richard Grey Power Company power conditioning, BlueJean cables. No acoustic treatment of room that is roughly 20 x 15 x 18 high.
Parasound recently released a new version of the Halo at MSRP $2995 I think. I bought mine 'used' last year, less than a year old, on Audiogon for $1400. $3-5K is a great price point, whether used or new. I agree with a previous post that something too analytical (e.g., Krell) might not be a great match with Salk, which is already quite analytical. Used McIntosh integrated might be a good match.