Simon,
I know what you mean...I live in a condo, with limited space. Having tanks all over the place is not my wife's idea of "neat". Luckily, I have a friend who QTs them for 3 weeks, before I bring them over to my place.
Exactly what Seamaiden says- are the reasons why you should do a bare tank. In the long run, it's just easier. Also, don't skimp on the QT... it will cost you... every shop by me has "sick" fish, that should be QT'd before even thinking about putting them in the display tank.
All the best!
~wings~