Which Graphics Card and SMPS I need to use?

Im planning for Graphics update of my PC. My PC having 300W Powersupply now. I can buy maximum 360W SMPS for this.

Which Graphics card need to select from these?

ATI Radeon HD 5450, HD 5670 and HD 6670

Also please guide me which powersupply can I select for this Graphics Card : 300W or 360W (not more than that as my UPS not support more!)

My system configuration is as list as below:

Intel DG41TY Motherboard
Intel Pentium Dual Core E5200 2.5GHz
2 x 2GB DDR2 RAM PC2 6400 800MHz
Seagate 500GB SATA2 HDD 7200RPM
Seagate 1TB SATA2 HDD 7200RPM
LG DVD+RW
300W SMPS
USB Mouse
PS/2 Keyboard
18.5" Wide DELL LCD Monitor
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More about which graphics card smps
  1. If your PSU is a quality 300watt any of the cards should work.
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