What is a good power supply replacement for my computer?

I have the gateway SX2841-09e and i'm looking to upgrade the power supply because i would like to install a video card for simple pc gaming (cod 4, counterstrike, minecraft) and maybe newer, more modern games (battlefield, cod series, oblivion). I was looking at the Athena AP-MPS3ATX40 400 Watt ATX Power Supply... show more I have the gateway SX2841-09e and i'm looking to upgrade the power supply because i would like to install a video card for simple pc gaming (cod 4, counterstrike, minecraft) and maybe newer, more modern games (battlefield, cod series, oblivion). I was looking at the Athena AP-MPS3ATX40 400 Watt ATX Power Supply because it's small and compact. Would this be a good replacement or are there much better options out there? Recommendations definitely help!
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