Olympica Nova III or V?

Hi there everyone,

I have an option to buy either the Sonus Faber Olympica Nova III or Nova V. We have a 19.6’ by 22.9’ living area (6mx7m). Ceiling is sloaping, loft-style 1 1/2 volume. I love the Nova but I don’t have the opportunity to demo these in the space unfortunately. I’m also limited in how far forward from the walls I can place them. 
 

Do I go III and risk it sounding thin, or V and risk being overwhelming for room?

Which would you recommend if it were your decision? Any advice would be welcome! 

any comments or feedback would be great.