2 Channel Sub Woofer, 1 or 2 Sub-woofers?

If you were designing a (cost-no-object)speaker system having response to 20 Hz or so, would you choose to put one of the drivers in a separate enclosure located several feet away from the rest of the system? I think not. IMHO, each main speaker should have its own subwoofer...the driver which the manufacturer left out to lower cost.

two subs......there is a no brainer experience when you hear the difference, i waited a long time and wasn't going to do it, a friend who knows quite a lot said the bottom end was always in mono, but after adding the second one, wow , no going back unless as eldartford said....one speaker with proper crossover and all bottom end....do it....

Not to hijack the thread, but a related question I've been wondering for a while is if it came down to getting one very good sub vs. two decent subs for similar total cash outlay, which would you choose? Let's say one $1000 sub or two $500 subs?