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The 42HM48-2404 is a generic stepper manufactured by several reputable manufacturers. However, it is rated at 2.4 amps, so cannot be driven to it's full specs by the A4988 drivers in the Predator. I'm not familiar with the LDO unit.

For what it's worth, I'd go with the E3D units. They are available and known to work (at least by me). The prices are very reasonable. The price difference, even with shipping, is less than the cost of a spool of filament. E3D also has industrial quality pulleys, belts, and other critical parts so you can place one order with one shipping charge.

Even with stock Gates pulleys, I true them in a lathe before use. If you go for cheap on Ebay, I can pretty much guarantee that you will get what you pay for, and you will regret it. Accuracy, repeatability, and reliability are not cheap.