Tax returns are here and I need to make the next move to upgrading my system. Currently, I am running Vantages (fronts), Focal CC800V (center), Montages (rears), with a Cambridge Audio 640r. I was debating on replacing the rears with some ML Sources, but unfortunately have not been able to truly demo these. Should I do this or make the plunge for an ESL center channel? Thanks for your input folks!