PSU went bang!

My girlfriends PSU just packed it in, not surprising really as it was a cheap brand and way watt for the system. So I'm looking for some input into what to get. She running an AM3, Phenom x2 545, 2x2gb DDR3, ATI HD4870 and 2 sata hdds. Wondering what kind i should look for in the new PSU. Iv only got about $100AU too spare on its and she's not willing to wait as she wants her computer back for portal 2. So any help would be appreciated.

My girlfriends PSU just packed it in, not surprising really as it was a cheap brand and way watt for the system. So I'm looking for some input into what to get. She running an AM3, Phenom x2 545, 2x2gb DDR3, ATI HD4870 and 2 sata hdds. Wondering what kind i should look for in the new PSU. Iv only got about $100AU too spare on its and she's not willing to wait as she wants her computer back for portal 2. So any help would be appreciated.

Kamuikankatsu