I use a pair of Event 20/20 BAS audio monitors.
The "BAS" of course, stands for "Bi-Amplified System", which means it has 2 intergral amplifers to drive the monitor. One amp drives the woffer, and one drives the tweeter.
I'm not sure, but I think the Bi-Amplified System helps eliminate crossover.
If money's no object between the two, I'd go with the BAS's, but I have never heard the non-BAS's.