ok, ive just tried Quintissential player, freeware from

[url]http://www.quinnware.com/[/url]

with the plugin "QueueIt"

and the whole thing works perfectly...it queues an album from right click play in orange, it will add a new album onto the old playlist, it can add a single track to a list, it plays on startup and it will delete the old playlist when you queue the first one...

try it