I don't have much experience with S5.4; just a general comment about floorstand. I upgraded from 1.3SE to C2 a year ago. Definitely a step up as far as range in the tonal spectrum. However, I find it very difficult when it comes to placement. I am still working (vigorously) on it even after a year, and still not entirely happy with it. So, beware that it will be very demanding to place the spkers properly. Just my 2 cents.
