Reply to DDJ SX vs CDJ

Okay so guys. I currently use a Twitch with itch and I love it. I just use the twitch for home and I usually use club CDJs when i'm playing live. I want to upgrade my gear at home to a DDJ SX or a pair CDJ 850s so i can practise at home to take my live performances on the CDJs at clubs to the next level mixing more complicated stuff. What does everyone recommend? Its obvious that a pair of CDJ 850s and a mixer would cost about double than the ddj. I would just like to know, how close is the ddj sx to cdjs. thanks.