Vandersteen 5a vs Quatro ct which do you choose?

Quatro's would be a better fit. How high are the ceilings?
Bob

Bob, the ceiling is 8’.

Bob , do you think the 5a’s would be overpowering for the room and the reason for your suggestion of the Quatro ‘s?

From what I have heard, no. 
But, considering room design and cost, I think the Quatro's would be your best move. 
Don't take my word. Ask John Rutan at Audioconnection ( you can PM him here on Agon). He knows Vandy inside and out and will give you the best info regarding the speakers and your equipment.
You can also call Vandersteen. Mr. V. will call you back the next day- Just be sure to have all you questions lined up, as he can be a bit abrupt.
bob