Hi! I'm planning to upgrade my system but do not know where i will start. My system is harman kardon AVR635, cambridge audio 640c v2, yamaha dvd, my main speakers are bw 604 s3, 601 s3 for surround etc. But I seldom use them on movies. I always use it for music. Is it a good idea to change my speaker first or should the cd player or amplifier? Which one should i go? Actually I have some speakers that I've heard already and i'm impressed like the monitor audio PL100 and bw 805s and i would like to hear also the sonus faber cremona auditor. If its the speaker that I need to change which one? Do I go for 805s or the more expensive MA PL100 or sonus faber. Need help...... thanks!