Hi Raphael Argus, Antec makes a very good PSU. I have the 430watt True Power 2.0. When I build my new PC in a week, I will be buying the 550watt TP 2.0. They are SLI certified and has the option the control your fan speeds depending on the load/draw put on the PSU.
These Antecs 550watt True Power 2.0's are the same except....
This one has only 1 fan for $89.99
This one has 2 fans for $93.99
This one has 1 fan and a fan control panel for $99.99
The fist PSU on the list is the best rated 501-600 watt PSU at Newegg, But all 3 on the list have the same insides with dual 19amps at 12volt rails or 38amps at 12volts(that's good) The biggest complaint is they have to many wires and they are too long, But that's really a good thing, I cut all the extra wires off of my 430watt, No big deal