How big is the room in the basement? If you like the speakers you have, I don't know what you will achieve by getting floorstanders. That is, of course, if you have a subwoofer. If you want higher quality, go with a higher line than the Monitor series. But, since you said you like the ones you have, why bother? I think a good/great subwoofer would be a better investment. In fact, if I had my time back, I would've gone with bookshelf speakers for my HT mains and spent the extra cash on a better sub.