Honestly, I would go with a 4650 over those cards any day. The 4350 was not built with gaming intended. It should work with your computer, with no problems. I had an XFX 4650 on a similar system, but the PSU was rated at 250W.
$39 after mail-in-rebate
Newegg.com - SAPPHIRE 100253HDMI Radeon HD 4650 512MB 128-bit GDDR2 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Low Profile Ready Video Card
$39 after mail-in-rebate
Newegg.com - SAPPHIRE 100253HDMI Radeon HD 4650 512MB 128-bit GDDR2 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Low Profile Ready Video Card