BobL = -1
The "size" of the speakers or subs has no bearing on which over powers which when playing content...until one approaches the limits of the weakest link.
When you were referencing "linearity" above, I was confused as well. However, taking the time to understand what context you are using the term for, I now understand what you are attempting to convey.
A system (speakers and subs) calibrated for a flat response across the frequency spectrum, will increase/decrease in a "linear" fashion as one adjusts their AVR volume. Meaning, if you increase your volume 3db, the entire fr will increase accordingly...until you reach the limitations of your equipment.
The only time the sub will "overpower" the speakers is when a system is not properly calibrated or the speakers reach their limits before the sub does.
I do not recall the OP identifying cosmetic (size) requirements/limitations or frequency extension goals.
Regardless of his goals, I don't see how/why anyone would recommend a poorer performing (more expensive) product. Does the Genelec have some sort of independent auto room correction or internal DSP optimization built in?
Even still... SVS + miniDSP 2x4 + miniMic/REW = Superior product, cheaper and the added benefit of learning A LOT about how to properly setup your system.