Do not go with the Rotel 1080 if you are looking to warm up those speakers. Ii have owned the 1080 and it is anything but WARM, it is certainly on the bright side. The Cayin would be a good choice as would a Jolida 302BRC. The Jolida is an integrated using EL-34 tubes thus giving you the ability to take the reciever out of the mix if you wish.
Looking for power amp with warm, smooth sound
Have some Monitor Audio RS6's that are sounding bright and fatigueing to my ears with my Marantz 6003 receiver. Would adding a power amp with warmth tone down the brightness and add more fullness to the sound of the speakers? I would use the Marantz as a pre for now. Any recommendations for one under about $1200?