The only other ones I know of are the Small HD's Ultra Bright Monitors which also feature 2.200 nits. When they released it, they claimed the title as world's brightest monitor.
? weird... D'oh... my bad.
Feature wise, these seem hard to beat. But what I would really love to see is a test/comparison on how accurate they display color. Especially with 3D LUTs now being implemented, accurate color representation is even more important.
Sorry guys, you got the specs of the HM170 wrong. No XLR on that one.