Vandersteen 5a vs Quatro ct which do you choose?

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

Another member is Ctsooner. He just got his Quatro's a year ago, and his room is quite large.
B

+1 Johnny Rutan.
Also, Richard V himself considers the Quattro CT the "sweet spot" in the model lineup.