I'd think changing your L/R speakers to match your center could be a good move, altho not all that familiar with the SCS01, not clear what the L/R are now either (more SCS01's?). Hard to know where you feel your system is lacking without more info, tho. You might appreciate a larger more powerful sub, but in a room that size what you've got now is probably pretty good. You can always buy more content to enjoy rather than hardware, too....