I'm not sure what I need

I see both pieces are for sale in the classifieds. Would I notice the Krell sounding significantly better than the Anthem while watching TV? Does the Krell have some feature the Anthem doesn't have? Is the build quality that much better? It definitely looks better. 

BTW, I very much appreciate the help!

Would I notice the Krell sounding significantly better than the Anthem while watching TV?

Probably not.  In your system I wouldn’t pay up much for the Krell as you’ll likely be very happy with the Anthem.  And Anthem also has rock solid reliability — not sure about the Krell although I’d guess it’s good too. 

I now have an Anthem AVM 60 on the way and I expect to be very happy with it. I really appreciate the responses. You guys were a lot of help. I really didn’t have a clue what to get.

Now I’m thinking of adding a sub or subs to this system. It’s in a bedroom with limited space so consider that. What would be an appropriate size sub to add to this system? I use it for television and almost no music. Would adding a sub improve the overall listening experience significantly?

Yes!  I use a pair of KEF KC62 subs to augment LS50s and they pair very well, as they were designed to do. It’s amazing these little hi-tech subs can deliver both felt and heard pipe organ pedal notes, and can also high-pass to the LS50s. You might take a look at Darko’s You Tube review.

db

The KC62s look very good. I'm considering them as well as the REL T7s. 

My room is 14'x16' with an 11' height. Do you think one sub will do it or do I need two?