Crossover

Looking at getting an active crossover for ARC Ref3 -> Bryston 4b's -> Magenplanar 20's.

I am interested in high quality sound but am not a member of the the grunt and groan posse ("Yeah, yeah, I finally heard it, I think...maybe"). I am more bothered by inappropriate sounds, hums, etc than the kind of stuff you read in Sterophile, Abs Sound, etc. I am willing to spend real money if necessary but would like to be sure it is worth the effort, time, $ etc

I have an aversion to spending lots of money on a device I have never heard and that would be the situation with most of the high end crossovers, ie, no way to audition.

So... are these little pro audio devices like Rane, dbx, Behringer:

-Worthless, terrible and worse than what I have now (stock passive Magneplanar crossovers)?
-Possibly useful and workable - worth a few hundred bucks and better than what I have now?
-Other?
-Just leave well enough alone and go on down the road?

Any opinions and thoughts appreciated