Probably makes more sense just to get the TV, since it doesn't seem that space is a real issue. The only reason to pay $300 for the adapter would be if you truly wanted the iMac screen to be your ONLY screen. In my opinion TV's are still better/easier for watching shows and game systems. I played with the idea of these adapters but you'd basically need the HDMI to ThunderBolt adapter and probably a HDMI splitter to make things easier...get expensive and it's not even possible yet.