While I understand the design aesthetics can be a big factor (otherwise why buy a B&O at all?) I've never regretted buying a larger set. A larger set will provide much more of a suspension of disbelief, immersion in the story of a good film or show. At times when I've gone with a bigger set at first I sit back and go "wow, that's big, did I do right?" but within a few days of being more immersed in the video my attitude has always been "Man, I'm glad I got the bigger one!"
And given how awful the movie theater experience is in the local multiplex where I live, having a larger set with great sound is a great thing to have.