Two issues with the 801 Nautilus: (i) they do in fact require a big room because of their prodigious bass and your room may be too small, and (ii) they require a ton of power, to the point of needing to be biamped with big solid-state, which means an amp that uses feedback (and thus all of the problems that feedback brings).
That said, if I had a huge room, listened only to rock/pop (i.e., crap multitrack recordings of electric instruments), and didn't have a lot of money, I would definitely consider them - great bass and boom.