Hi Liz -
I thought some of the PB's thoughts were an excellent example of what we see very often in the pool industry. PB's that are not up to speed on things. They like to do things one way and not adapt. Sometimes you just have to let them know what you want and live with their belly-aching. There are so many things inaccurate in your item #1 above. First is almost no one benefits from having a single speed pump (some really simple non-SWCG and non-heater pools can). They are loud and inefficient. Neither SWCG's nor heaters benefit from having pumps run at high. In fact its the opposite, with both of them often requiring longer run times with lower flow. VS pumps aren't complicated, they are modern and efficient. His comments regarding algae and pump size are just ridiculous. There is almost zero relationship. Selling you equipment based on how quickly it will clear up algae is non-sensical.
For SWCG, the name of your product is Hayward AquaRite (not Aquabright, which is concidentally the name of a pool plaster). The AquaRite is rated for 25K gallons. We say a SWCG should be rated for 2x the pool volume. The caveat to that is if you live in the northern half of the country (many fewer pools thus our advice), you can get away with a somewhat smaller SWCG. For example, mine is 1.67x and in MD and I don't have to run my pool more than 10 hours in peak summer sun/heat. For you, 25K/16K = 1.56x. That's still OK being in NJ, but much closer to 1 and you'd want to upsize to the 40K version, 940. The issue becomes that in order to produce enough chlorine from your SWCG, you may approach 12 hours of running your pump per day during the peak period of summer. This may be more than you would otherwise need to run your pump, and therefore be causing you extra pump expense. However, if you have a VS pump, running a pump on a lower RPM is only using about 300 watts (or less) per hour. Or well under a $1 a day.