I am not a big fan of harness bars, or non schroth harnesses in cars without roll protection.
If you want a place to attach 5+ point harnesses, they come on the harness bar on a roll bar.
The Schroth harnesses are the only ones that are DOT approved for a reason. They have done the safety engeneering and testing to meet those requirements. Other brands haven't.
An autopower 4 point is < $500...
http://forums.nasioc.com/forums/show....php?t=1005822
So if you want a harness bar, put in a hoop or 4 point bar is my $.02...