In the card I posted, it says...
"250 Watt or greater power supply recommended "
Power suggestions vary based on the card. One catering to people who just want to output a video to a TV obviously doesn't need a high-end GPU and thus a high-end power supply. A 600W power supply can power just about anything on the market, from the simple cards to the gaming ones. If all you are wanting to do is put Netflix and video on a television, it doesn't make much sense to go for more than a mainstream graphics card with lower specficiations, you won't see any improvement. With power supplies, you get what you pay for, I usually suggest Corsair, Silverstone, Seasonic, PC Power, and Enermax power supplies.
One of the least expensive current generation cards is the XFX FX-775A-ZNP4 Radeon HD 7750 Core Edition 1GB
and I think you don't need all the performance it offers for what you're doing. If all you're wanting is to put Netflix and a few videos on a TV, the SAPPHIRE Radeon HD 6450 1GB
is as basic as you can get. Both of these cards require a power supply with more wattage than you currently have, with the 7750 requiring a minimum of 450W. Note that if your PC is from earlier than 2008, you may have a proprietary Dell power supply.