Thanks for your input. US Seal seems to have three lines:
GOOD
-Buna/Graphitic Plastic
-Industry standard for general pool applications
-These seals are NOT RECOMMENDED for spas, ozonators or salt chlorine generators
BETTER
-Ozone/Salt Service Seals
-Viton/Carbon Graphite
-Use for applications involving salt chlorine generators or ozonators
-These applications require tough seals
BEST
-SCS Silicon Carbide Seals
-Silicon Carbide, Viton & Stainless Steel
-For your most demanding applications
-Superior abrasion, corrosion and chemical resistance
-Best choice for salt generators or ozonators
-More forgiving when pump is run dry or accidentally loses prime
-Compatible with all pool & spa chemicals
-The best seal on the market! Upgrade your customers and provide them with peace of mind!
The "Best" seal runs anywhere from $51-94(!) Definitely not an option for me. The 'better' seal runs around $14. I would have to purchase the seal and o-rings separately (rather than a GoKit), but that's not a big deal.