Increase Waterfall Flow? How about Pondmaster Waterfall Pumps?

Howdy, all.  This is my first post to this newsgroup.  I have done a
little searching and have not found an answer.

Basically, I am interested in your opinions on the Pondmaster
Waterfall pumps -- specifically the WFP2500.  Generally, I am
interested in you opinions on my present system and how I might
improve it other than using a Pondmaster Waterfall pump.

My present pump/filter is a Pondmaster Magnetic pump (1200 gph).  It
draws through a PM 1000 filter (12"x12") that contains a coarse
polyester pad.  The outlet feeds through 3/4" tubing up and around to
my waterfall pan.  The height is about 6' above the pump.

Basically, the flow stinks and I want to improve it.  I thought of
getting a larger pump and filter box, but my pump should be large
enough now.  Perhaps the filter box is restricting the flow.  Another
idea is to simply add a waterfall pump (like the WFP2500 I asked
about, above) and redirect the outlet of my filter pump to something
at a lower level.

Any comments or suggestions would be appreciated.  I know a lot about
saltwater and freshwater aquaria, but I am pretty much a pond newbie. 
I acquired a small pond with my house and I would like to keep it
going.

Thanks,
Scott