NS6: Good choice excellent controller, plus Itch 🙂
B215D: Terribad speakers. They are loud (if that is your thing) but the sound quality IMHO is crap. If you play any kind of music that involves a melody and singing/rapping they will sound bad.
Numark Red Waves: Some swear by them, some don’t. I never actually liked Numark headphones, I am missing something in the response of them and I have a really large head… so they are not so comfy. You can go with kinda cheap headphones you might want to look into either the Zomo HD-1200 or Technics 1210s.
The Numark is NOT a power mixer. It is a DJ controller that needs a power plug to operate, it will in NO WAY power passive speakers.
So you have 2 Options: Buy active speakers or buy passive speakers with a separate amplifier. As for the easy setup I would prolly go with active speakers. I would look into a combo with a sub if you play anything in the house, deep house, techno direction. There is a lot of used gear available, if you have someone who can decide how the gear is holding up, then you might be in for a bargain, as it is often sold very cheap from rental companies that need to show off new gear, while their used gear has still many years of live in them.
However the question of PA systems comes up quite often on this board and I have to say:
There is no cheap PA that will sound good. It may sound good if you are alone in a store and someone cranks it up. Your brain will melt from volume alone… put 40 people in front of this PA and it might be as silent as a fart infront of a jetplane and as muddy as the florida swamps. You will play for people and people in front of speakers are sound and volume killers. Only good PA systems will mitigate this and still deliver music in a good sound quality at good volumes.
Simply put: I have yet to hear a PA system below 1000 bucks that I would even use for 20 people parties. I have sold all my cheap PA crap that I thought would be cool over the years.
Nowadays I play A LOT of mobile gigs (weddings, business parties,…) and I have simply hooked up with a rental company. They rent highend gear for decent money, I put that in my contract that this is to be paid by the client and thats it. Yes I might over time make a better cut if I would buy a PA, but this way I have satisfied clients, my back is intact as I do not carry the PA, the rental guys come and set it up (together with an excellent lightshow if needed) and thats it.