I've only seen 1TB in the past couple of months.
You will need 1 TB. Each AAA game these days is about 50-60gb install irregardless of digital or physical disc format. Given that the system requires about 70 to 80 gb free for installation caching and other OS stuff, you probably can only install about 6 to 8 AAA games at most. It is not enough.
That is unless you are willing to rip apart one of those portable 2TB HDDs and install it yourself, then go for the 500gb model.
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