Well after much researching I finally found the Intelliflo VS 0118 pump for a price that suited me. As I was about to hit the "BUY" button, something caught my eye, it was an IntellifloXF VS -005 pump that is supposed to be more efficient then the -018 pump. Does anybody have any info on this? I can't seem to find a comparison chart to see what the differences are. If I'm going to spend $800 plus bucks on a pump I might as well get the best and newest model out there. If anyone has any info on the differences between these two, I would appreciate some insight. I haven't checked out prices yet, but I am going to start that now. TIA.