The BMR front bar is supposed to be identical to the F-body front bar, so if you are using the HO rear bar, I think you will see a real difference in handling between the BMR front bar and the HO front bar, with the BMR front bar, I think, being more neutral. You might want to read the Mueller write-up that's on the B-body.net website before making your decision. If you do a search in this section of the forum, I think that write-up has been linked to before.
As far as the BMR rear bars, I don't know anything about them. Someone else may though.