I have a similar size tank with a Vectra L1. It hasn't missed a beat since I bought it in June 2016. I keep it at the lowest setting, so a S1 is likely enough for you, but perhaps keeping the power so low has helped with my longevity? I don't know.
Also, with the current sale, I would look hard at the COR-20 for the same price as the S1. It's a stand-alone pump and doesn't require an Apex connection. I like to keep my returns on a dedicated outlet. Reviews of the COR-20 are also generally very strong. I almost bought one for a redundant return pump, but plumbed in a spare Jebao DCT 4000 instead (It was a backup pump for my skimmer.)