Reply to Advice on Equipment: DenonMC6000 or NI-S4

Good Day folks. I have a sort of a basic question. I am very new to the DJ world - have never DJ'ed, except for a few house parties using my home stereo. I want to learn how to DJ probably using professional gear . I will not go into club gigs, but would love to do house parties for myself, family and friends.

In view of the above, I wanted something like the Denon MC6000 or the NI-S4: Both can connect to my computer, and help me learn the ropes. But what I am not sure about is whether it is advisable to invest that much money ($800) in such an gear when I am just starting out? Or would it be better to settle for either of their smaller sisters: DNMC3000 or NI-S2? Are there other more competing controllers / mixers you would recommend?

I don't have any other gear and plan to get speakers after the mixer. I will appreciate your advice.

Thanks - - Oyiwaa