Memphis audio
Image Dynamics
Crystal Audio (big money)
Kove Audio (dont much much about the current line though)
Hi End JBLs i think its the GTO or one of the not so often seen series (the surround looks more like a club speaker but in the right bandpass box, you cant blow it and will be louder with a singe driver then any dual driver of similar price).... I know from experience with a driver purchased back in ummm... 199?3-5