The Amazon kit doesnt list the brand of components. Whether you go with OEM or aftermarket parts, I would still go with eBay since they seem to have the best pricing.
For the same price as the Amazon link, you can get an eBay kit with a genuine Aisin water pump (no thermostat and hydraulic tensioner though). You can tell that it is an Aisin pump because the gasket has a rubber liner, so no additional liquid gasket is required. I'm not sure if I would trust some of the cheaper fiber gaskets without some sort of liquid gasket ontop.
IMO, with our 5VZFE engines, I would prioritize having a better quality water pump over the belt itself. If the pump fails, you overheat. If the belt snaps, the engine just stops running (but it's a non interference motor, so meh).