To my ears, swapping out electronics is the final spice on top of the entree. Meaning, (and don't get caught up with my percentages)
I think the speakers themselves are going to be 90% responsible for what you hear (if not more?) and the electronics the balance.
I've had some lowely 4 watt monoblocks on my Klipschorns and a 100 watt tubed McIntosh amp (MC-2102). To my ears, playing within the realm of the 4 watt monoblocks, these two amps sounded more alike than different.
Of course, when the throttle gets mashed and now the 4-watt amps are running out of gas, the McIntosh amps sound better.... so "within a common operating range" as my qualifer, I think you'd be harder pressed to pick different electronics than you would be to pick different speakers.
Which is why I say look at other speakers. You can put a 1-million dollar set of electronics in front of your speakers. It will probably sound better but still might not be what you're looking for. Conversely, you might be able to put a "X" thousand dollar speaker on your existing electronics and find your answer.
Just my .02....good luck!