Guess i'm confused on why you wouldn't hook anymore speakers up?
The Bose 402w are not regular home speakers - they are more for
the pro audio side and need a correct controller (equalizer) to work,
plus the word is that the impedance is said to drop real low.
The Klipsch KG4 is the powerful one - and can do some decent bass
The Zenith may be Ok for you - maybe save them for separate use
or if you do like them, then use as surrounds.
Optimus subwoofers tend to be on the boomy weak side, as far as
subs go - I have owned some. However if budget is tight, they may
help to augment the bass - to fill the room some.
While the Bose 301 has its limitations - they can work for surround
use in home theater.
For 2 channel music listening, the others will fall behind the Klipsch KG4
and will be a mis-match for surround music.