Pump and Filter system

Looking for a recommendation for a new pump and filter system for an in-ground pool with no water features.
The pool is 18000 gallons, head length is less than 40 feet. I have DE filter now. what is recommended a DE or Cartridge filter?  Also what requirements are needed for power for a dual speed pump or the new Primp pump single speed (I have now 230 Volts 1HP motor) will new wiring needed to be configured or able to use existing power? 
Supply lines inlet and outlet are 2" PVC.

We’d recommend the PureLine Prime model PL2605. The PL2605 is a 1.65HP variable speed pump with 2" ports. New wiring will not be required. You can use your existing lines to wire the PL2605.

DE filters will catch smaller debris but I like the cartridge filters. Cartridge filters don’t require backwashing or messing with DE powder. I’d recommend the Pentair Clean and Clear 200 model 160318. It would be oversized for your pool but it wouldn’t have to be cleaned very often.