I like fine wood panels or casing, ex., Unison Research, Dodd Audio (I own the Dodd Mono 50s which have wood face, rear and side panels: curly maple in my pieces).
Check out the new Response Audio Musica Bella series. All wood casings in a variety of fine hardwoods that can be mixed or matched. Quite beautiful. Initial reports indicate excellent sound as well.
No connection with Response Audio.