Hello, I have a rather old system, which is valuable to me and I plan on upgrading. At the moment it looks like that: AMD Athlon 64 X2 6000+, Acer F690GVM, 4GB RAM, Sapphire Radeon HD5450. As for PSU, I have my eyes on either Corsair's CX500 or GS600, would love an advice. Will be used mostly for gaming. Thanks in advance!