I have an A/V Processor : McIntosh MX123 and Power Amp McIntosh MC255. Speakers : Focal Electra 926 Upgrade thinking options For Stereo : 1. Upgrade to Focal Sopra 2 2. Adding a McIntosh Pre (?) to the present system 3. Leave as it is as the MX123 can play in Stereo mode also .... Thanks.