Vandersteen 5a vs Quatro ct which do you choose?

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.

i think a call to JR or RV is good. I have owned 5a and now 7 and Treo CT, so perhaps you might call me biased.

your room is not an issue, especially ceiling height- Vandersteen engineers the tweeter height to be remarkably similar across the line...for a reason!!!! your floor is treated :-) w carpet...maybe add some natural diffusers....but the big virtue is powered bass and 11 bands of analog eq. the tweeter on the CT is better than the 5a
the subwoofer on the 5a is better....

competently setup w good source I would call it a draw. smaller rooms favor the Q

now if you are guying new, get the Quattro, pick your wood or automotive finish AND enjoy the ocassional upgrade opportunity as an origional owner...

stretch for the demo 5a Carbons on audiogon.......those are world class......yum