There is a world of difference between the Usher series speakers. I've owned the X series in the past. They sound pretty good, but are not as detailed in the mid's and high's.
I now own 4 BE 718's and the new BE center channel. The BE series is balanced from top to bottom, great highs, sweet mid's and good low end punch from a monitor. You can pick up the 718's for around $1,600 - 2,000 pair.
Read the huge amount of reviews on these speakers. Keep in mind it is not just the tweeter and woofer that make the speaker.
The BE 718's have enhanced crossovers, capacitors, tweeters, enclosure design, finish. All of these factors make them better than the X series speakers.
Hope this helps.