I'm in the market for a used cc to go with my Studio 100 v3's. Could someone please clear up the different versions/model numbers? Are the 470 and 570 old versions of the 590 and 690? Is there a 670? Which ones are Monitor series and which ones are Studio series? Lastly, how detrimental would it be to use a Monitor series cc with my Studio mains. My system is used for 85% music 15% HT. Thanks in advance for any help!!