If it is a sump you'll never see, rubbermaid is the way to go. Glass or acrylic would be nice, but it would a spendthifty thing to do. Harder to work with and a higher investment.
As for the pump, it depends on the size of bulkheads you'll be using and how your plumbing is set up. 600-800GPH is a rule of thumb for 1" bulkhead drains though. If I were in your position, however, I would get a small return pump and jack up flow using closed loops, Seios and whatnot.
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