xbox one cheap

Hi guys!

I've been thinking about getting a Xbox one, i had the original Xbox back in the days.
So i see prices have dropped by now since release and i know there is a different packages with red dead redemption with owerwatch with this and that. Now i found this website https://howmuchisaxboxone.com this seems the best price to me is there anywhere better offer do i need to add something i don't know anything, how big Hard drive do i need?

Thank you in advance!