Floorstander or Sub/Sat

I'm agaonizing over whether to get, for music, floorstanders or bookshelfs+sub.

To my thinking, the ability to eqalize the frequency response of the sub(for as little as $100 with a BFD), would confere the biggest advantage.(I'm only allowed a minimum of accoustical treatments i.e no bass traps).
Standmounts also tend to sometimes image better that their floorstanding counterparts.

I'm hoping someone can point out something in defence of floorstanders that I may be overlooking.

Sincerely,

b.