EcoPumps are basically overpriced two speed pumps. The motors use a run capacitor for the low speed which helps low speed efficient but not enough to make a big difference when you compare it to a regular two speed motor. You might save 20% on low speed but low speed uses such little power anyway, saving 20% doesn't amount to much in terms of $.

Plus you can now get an A.O. Smith two speed motor with dual run capacitors for around $300 so you could just upgrade your current pump with a new motor and perhaps a new impeller/diffuser.

I am not a big fan of UV systems because in order to do any good, you need to run pump which is more electricity. Chlorine is the only sanitizer required in a pool.

The robotic cleaner is probably the best choice you made. It can run without the pool pump which is a big plus.

Here is a link that might be useful: AO Smith Motors