Hi Evan.

Try this link http://www.peachparts.com/shopforum/showthread.php?threadid=76200
for more choices.

In my experience,I have noticed that if a manufacturer
has been around for as long as those that you mentioned
you need to have high quality products otherwise you
just won't last.

Quality wise the 3 first units are all high quality,high end
products and are from manufacturers that have proven
track records.Also their customer service should be
of the same high quality and I think problems are rare
but not impossible.

I have no experience with becker units but since
MB uses them you would think the are of good
quality but I don't think they can be compared to
an aftermarket unit.

Louis.