I have an opportunity to purchace a set of Monitor 2 A's. The guy is asking 475. They look like they are in mint condition, right down to the foam in the walsh tweeter. Buuut, I've come across a set of QLS 4's for 300 and had been re coned by a professional. What would be a better choice? I already have a set of Column 2's, I was thinking the Monitors would accompany them nicely, but the column 2's are a sealed design and the Monitors are ported. I am not sure how the two would sound. Whereas the QLS 4's are sealed with the watkins woofer. What to do, what to do?!