biamping Usher BE-20's

I was thinking of biamping my Usher BE-20's. My Audio Research 210's would drive the mids/tweets and maybe one of the class D amps for the bass. I'm thinking Wired4sound, Bel Canto 1000's or??? The 210's are rated at 27db gain so I figure if I can get a bass amp/s with the same gain it should work good? I can always get the Endler attenuators if needed for the bass amps. Any suggestions/opinions about how this might work and sound? I'm a little concerned about the 540hz bass/mid xover point on the 20's - 540 seems kinda high to me.
thanks!