Reply to Which decks should i choose?

Hello everyone on DJTT!

I want to take my DJing "to the next step" with the new gear . But is ambivalent about what to choose and what should suit me best.

My current setup
DDJ-T1 and Traktor Pro with my Macbook Pro
Gaming headphone
Standing up against my wall in the kitchen
HiFi speakers

Requests for money were not a problem
CDJ-2000 and DJM-Nexus 2000 Nexus
V-Moda Crossfade LP "
Built DJ Booth in the living room
genelec 8010

The problem is I have no idea how much money whatsoever but has a permanent job shooting plus a little as it is possible to save up for anything, but the question is whether it is worth it or if it's just me who is interested in technology and want it "best"

What I do not want is TC with Audio 8 and my computer with cdj 800 for example.

So as I understand it is my choice

CDJ-400 and DJM 400
or
CDJ 900 and DJM 400/800/850/900/2000
or
CDJ 2000 DJM 400/800/850/900/2000
or
CDJ 2000 and DJM Nexus 400/800/850/900/2000

What would you recommend if I want to move on in my DJ playing?
What do you get the best experience / Functionality for the lowest price?

Since the speaker ..
What do you recommend? I'm living in a apartment so i can not have to much bass ..
Having looked at the KRK Rokit 5, is it good?

Since headphones .. What do you recommend?
Looked at:
HD25
V-Moda Crossfade
HDJ 1000/2000
Beats Mixxr

With my current setup, what do you believe I should buy first? What do most development from DDJ-T1 to get as close to the evening club gigs as possible?

Sorry for all the questions, answer as many as you can!

PS do not use the CD, would like to have as clear a waveform as possible.

Thanks in advance
/Niklas