I'm trying to figure out if Apple TV is the way to go. I've started to buy TV shows and music videos. I have them on my iPad and Mac. The reason I'm asking is because I currently am with Comcast cable (which has On Demand, etc.), and I also have a Blu-ray player. Where would Apple TV fit in this setup? I am currently using iTunes for episodes (or videos) that are not available on Blu-ray or Comcast. In other words, iTunes has its own little niche in my setup. But how would I use Apple TV? Do I have to have my computer on to stream stuff? Is it impractical? I love watching stuff on my iPad and iMac, just wondering if I should give these purchases some TV time.