I like the milwakee, because they are a good value and reliable. Also they come with a built in AC adapter. This is a separate purchase with an American Marine controller. If you splurge for the PH controller you can always hook it up to a calcium reactor down the road. Also they are used for freshwater planted tanks.
ORP/PH combos are popular, even if you are not running ozone, monitoring ORP can give you a limited snapshot of the health of your tanks and alert you to a problem before it gets out of hand.