Standmount speakers and a decent subwoofer often (depending on the quality of components used) can be even better than floorstanders on there own.
To be honest I have Mission M73 floorstanders and a nice active subwoofer
The Mission M73's are pritty good at bass on there own, depending on the room size and the amount of power applied output is strong to 40-45 hz and then starts to roll off.
With room gain you still get some usable output at 35hz.
Not bad at all for speakers that don't break the bank.
As for cable lengths they make no difference unless you are running very very long runs.