For my main light source, I would use the softboxes, one as a main, and the other as a fill. Place the fill close to the camera position. I would base my exposure on the illumination of the main soft. I then would use a undiffused spots to create "kicker" highlights where they would look the best. Perhaps behind and above the subjects, carefull, don't "rim light" ears etc. Use as many "spots" as you see fit, but don't let them over power tour main light. You might choose to use some "flags" to create some neat shadows.
My thoughts on the above recommendation is to kind of simulate window light but with complete detail retained. Actually you could illuminate the scene with any one of your earlier suggestions, but I prefer a softer rendition for old music instruments etc. Good Luck!! And have fun!
Charlie.....................