Thanks Joe. So for fastest fill times, looks like the Tsunami T1200 is still the way to go.
I installed the Johnson pumps this spring and it has worked well with my 1100lb sac's.
Here is the over the top writeup: http://customfalconballast.blogspot.com/
and another one (has a link in it about someone who tested Actual Flow Rates of aerator and impeller pumps):
FYI, the mayfair aerator pumps really do need to be below the waterline to prime (scupper and moving forward is a good way to prime if mounted high). 1200gph is good, but Duffy who is a big surfer on WW, just put a manifold system and Rule 3800 aerator pumps in. He went with 1.5" throughulls. He's filling about 1800lbs in 4 minutes.