I am looking for a replacement SFX/SFX-L PSU for my current (SG13) rig and potential future ITX builds. I was running a Silverstone 450W SFX non modular PSU, which went pop and fried my beloved Maximus VII Impact board. I don't want to trust the Silverstone again, just in case it has a fault (the off load output voltages checked out OK on my multimeter). I'm currently considering the Corsair SF450, SF600 and Silverstone 500W SFX-L units, with a preference to the smaller SFX units at the moment Ironically, it looks like my original choice, the SF450 is out of stock in the UK for the moment, with the other 2 available generally. Is there a downside to using the more expensive and potentially over specified SF600 unit? I'll be running an ITX (poss mATX) single GPU gaming rig with an i5K, 2 drives and a GTX 970.