NDX500/400 Help

Have recently purchased a NDX500 and looking to purchase another soon.
Totally new to CD mixing as sold my turntables and my Hip Hop vinyl collection 8 years ago when I needed the money as I had a baby girl on the way.
Now I have decided to go down the CD mixing route I have a question If anyone can help?
I have seen a lot of NDX400's secondhand really cheap.
Could I get away with adding a 400 to run alongside my 500 or do I just get another 500?
I'll only be using CD's or USB so won't be connecting to PC/Mac.
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