Too bad you chose that power supply, you should be asking us first! There is a lot of PSUs in that price that could be better.
But since you got it it's OK. Just mind that if you need another suggestion you can feel free to ask here..
To get you a specific answer, you need to be specific. First, I would ask you how much are you willing to spend. Second, I want to see your current specs.
And, something that makes me confused, is your computer not fast enough to run a 1080p video playback? As far as I know, even intel's IGP can do that smoothly (Like y'know, HD 4000 or HD 2000).