As Ron said, no appreciable difference in these pumps.  I have installed
almost all of the ones listed onto either my own personal vans or customer's
vans with no real problems.  Actually the only pump I ever had returned was a
VW one (lasted a year).
The Graf pumps are supposed to be OE on BMWs and have German bearings (this
is what I have been told).  If you look at the Hepu shaft, it may be a German
pump, but it has Italian bearings.  Welcome to the EU folks.  Pretty soon I
think we are going to see all of the country names disappear from boxing and
just "Made in EU" or something similar.  Then we would have to go on brand
alone.  Usually this is fine as brand usually means that the QC (quality
control) follows no matter what country it is actually made in.  VWs made in
Mexico, Japanese cars made in the US.  It is a crazy world folks, better get
used to it :)

Thanks,
Ken Wilford
John 3:16
http://www.vanagain.com
Phone: (856)-327-4936
Fax: (856)-327-2242