Play a game for awhile, the fans on my PSU literally shut off unless needed, while depending your Antec's particular model that could be the same setup. So... load the computer and see if it kicks on after a bit. If not then
this one would be a decent choice for a cheap PSU. A PSU is part of the foundation of a system, a bad PSU could ruin your entire system, its okay to go cheap but not $20 cheap, you're just asking for major trouble then.