[ubuntu] Should I Buy a Video Card?

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http://ubuntuforums.org – I am having some problems with youtube videos on my computer right now, sometimes they're skipping and whatnot. I also am trying to hook my computer up to a tv and mirroring displays doesn't work and even at times sharing between my monitor and tv has problems. I also have a problem with the resolution with my asus 22" monitor, but that might not be a video problem, I'm not sure. Here are my specs, I'm running 12.04 LTS and want to get the most out of my system. I'm using intel's 2nd gen integrated graphics. But if there is a video card that will work well with Ubuntu and isn't very ex (Hardware)