I'm sorry, but watching a 50-55 inch screen while sitting only 3 feet away is ridiculous and very unpleasant for both the eyes and neck.
What's more is you said that you want to play games like this?
How the HELL can you play games like this? I tried playing Battlefield 4 on a 46 from around 5-6 feet and after half an hour-hour worth of playing time, my eyes felt like they were about to fall out of their sockets every time I turned my eyeballs to the corner of the screen to see the radar. I can't imagine how it would be on a 50-55 from 3-4 feet away.