I have a 3770k, two GTX660, Asus Z77V-pro, two HDD and other less power hungry componenets all powerd by a Cougar 550W power supply 24+20A 12v rails 80 plus Bronze. Since its about 3 years old i want to buy another one. My budget is about 100-130 euros should i buy a Bronze 700-800W PSU or a Gold 600-650W PSU ? i will want to overclock the system but nothing extreme 4.2-4.5 Ghz on the CPU and about 10-15% on the graphic cards. Thank you.