Sorry if this has been covered before but ... I am looking at a new 5.1 setup using the Anthony Gallo Nucleus Micro speakers and a MPS 150 sub. However I was thinking that i might add another MPS sub (5.2?). Would this be a worthwile upgrade or a waste of money? Perhaps a better single sub (although aesthetics plays a part - being part paid by the wife - so my first and second choices of a sub have been rejected). Other factors to consider are that the front end will be all cyrus (AV8/DVD8/Smartpower amps) plus I have the added problem (!) of stone tiled floors (with rug) and tall ceilings in a room 27"x 14". any help would be appreciated.