New
#11
Some benchmark scores from PassMark Software
GeForce GT 430 676
RADEON HD 6450 364
Radeon HD 4550 353
Radeon HD 5450 311
Newegg.com - ECS NGT430C-1GQR-F GeForce GT 430 (Fermi) 1GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready Low Profile Video Card
Newegg.com - GIGABYTE GV-R645SL-1GI Radeon HD 6450 1GB 64-bit DDR3 PCI Express 2.1 x16 HDCP Ready Low Profile Video Card
Newegg.com - GIGABYTE GV-R545OC-512I Radeon HD 5450 (Cedar) 512MB 64-bit DDR3 PCI Express 2.1 x16 HDCP Ready Low Profile Video Card
I'd spend a tad extra and get the GT 430. According to what I've Google'd, the GT 430 has a TDP of 50 watts, and recommended PSU of 300 watts. You should be fine with the Athena 350 watter.