I agree that one great sub is better than two not so great ones. But two great ones (stereo subs) is the way to go if you can afford it. So if you're on a budget, I agree to get one now and save up for the second one. For your speakers consider the REL Stadium III or even better a Stentor III.
one or two Sub-woofers?
I am considering a purchase of either one Audio Physic Minos sub-woofer, or two Audio Physic Luna subs. The total value of either package will be almost the same. My system consists of Martin Logan CLS speakers with VAC amplification. My listening room is of medium size. I would greatly your opinions. Thank you in advance...