Thanks to Jason and everyone who helped get me going in the right direction a bit earlier. I'm looking at replacing my single speed 2HP pump with a Intelliflo VS or VF. That pump drives into a Hayward 4050, as well as a polaris booster pump and SWG.
Separately, I've got a 1HP pump that drives a small waterfall feature which has 3 separate waterfalls, probably 4 feet total of water (horizontally). That pump has a filter as well, which is much smaller (a hayward with a single cartridge).
I was curious if it was possible to drive both of these paths with a single pump? Power wise you can't be pretty simplistic and say there is enough power for the intelliflo to do the work, but I wonder if the pressure differences would be infeasible. The main system drives about 15psi at the filter, the water feature maybe 3psi depending on how much of the waterfall bypass I have turned on. Of course, you'd also need a valve so you could shut off the water feature (may just leave it on, as typically I have it running most of the time the regular pool is on).
Just thought I'd ask if this is crazy, as it could make things a bit more cost effective and having an old 1HP motor to drive that is a bit wasteful.