I haven't really been following along, but just in case it's been missed; more expensive components can have a sonic benefit in the sense that some of the more expensive components have better build quality, are more consistent in their specs, have tighter spec tolerances, and will last longer. All things considered the general (read:majority of those with a lot of experience and knowledge on the subject) consensus is that better components make a difference up to a point, and then returns diminish rapidly. Furthermore, components
DO NOT improve the sound, but merely do a better and better job of not buggering up the source signal before it gets to the drivers. That is, unless you happen to enjoy the extra distortion or frequency shaping characteristics of the component, NTTAWWT (not that there's anything wrong with that). People choose speakers all the time based on how it sounds to them, even it what they're hearing isn't the most accurate representation of the source.
IMHO, there aren't many well versed, talented, and knowledgeable guys who would agree that a $700 upgrade that didn't change any of the component values, IOW the crossover itself, would be worth it. This is coming from guys much more knowledgeable on the subject than I, such as swerd.
I'm not saying you don't hear a difference, but who's to say that difference isn't in your head? You didn't A/B pre-crossover to post crossover as far as I can tell from a cursory read of this thread. However, if you're happy with the $700 you spent, power to ya. Just don't expect to rouse up a following on the subject round these parts