Only time I notice my height speakers is when I play Expendables 2 or Dredd since those were specifically mixed for 11.1. There is a DTS Neo:X Sound Check on those discs if you have them. It can probably be found on the DTS website as well.
My height speakers are the DefTech SM 55 running from the AVR, which can't keep up with the rest of my speakers at higher volume levels.
The SS-B1000 should do pretty good, at least on paper, with the other speakers in your system. You'd probably have to step up your entire system to go with better height speakers. My only suggestion on that would be SM 450's up front, CLR 2002 for center, the rest SM 350's, and an external amp to help out the Onkyo.
HD-DVD = 94
Blu-Ray = 120 ( 24 Warner red2blu )