Don't worry too much (unless it is really a space problem and you can't fit a larger screen in your room?): my experience is that each time I have gone for the bigger screen size, whether for my BV7 55", my iMac 27" or my iPhone 6 Plus, not only have I never regretted it, but I have afterwards always looked at the smaller screen sizes, being grateful that I chose the larger one.
You get used to - and fond of - the bigger screen sizes, that is really my experience.
VANTAGE