Need help upgrading graphics card on my Hp P6210f

Hello everyone,

I recently bought a used HP P6210f off craigslist, after my old computer crashed due to a nasty virus. I want to watch HD movies on Netflix, and Hulu, but the Gefore 9100 graphics aren't cutting it. I also do some light gaming, and want The Sims 3 to run on low-med. I have a $50 budget. The cards I'm looking at are....

Asus ATI Radeon HD 6450

http://www.amazon.com/Asus-Radeon-Silence-Profile-PCI-Express/dp/B004X8EO6Q/ref=sr_1_4?s=pc&ie=UTF8&qid=1434925926&sr=1-4&refinements=p_n_feature_keywords_four_browse-bin%3A6030981011%2Cp_36%3A1253504011

Asus Gefore GT 210

http://www.amazon.com/EN210-SILENT-DI-1GD3-V2/dp/B004I5UDO6/ref=sr_1_5?s=pc&ie=UTF8&qid=1434926266&sr=1-5&refinements=p_n_feature_keywords_four_browse-bin%3A6030981011%2Cp_36%3A1253504011

Sapphire Radeon HD 5450

http://www.amazon.com/Sapphire-Radeon-PCI-Express-Graphics-100292DDR3L/dp/B004N3BH0C/ref=sr_1_13?s=pc&ie=UTF8&qid=1434926297&sr=1-13&refinements=p_n_feature_keywords_four_browse-bin%3A6030981011%2Cp_36%3A1253504011

EVGA GeForce GT 610

http://www.amazon.com/EVGA-GeForce-1024MB-Graphics-01G-P3-2615-KR/dp/B00847TOLC/ref=sr_1_8?s=pc&ie=UTF8&qid=1434926372&sr=1-8&refinements=p_n_feature_keywords_four_browse-bin%3A6030981011%2Cp_36%3A1253504011

Specs

Athlon II X4 620 (2.6GHz)

6GB DDR2

500GB HDD

Windows 7 Home Premium 64-bit

300Watt Power Supply