Home Dub Sound System For Fun Set-up Advice Please

Hello any advice would be most appreciated and also would this setup work before I fill the cart?

The idea is to build a little reggae sound system at a budget price for my back room.

The two speakers one side of the room with sub-woofer at the front in a triangle set up with me in the middle hopefully smiling as I get hit with sound.

I'm keeping my Hifi system for all my other genres of music but I really wanna have some fun with my dub collection. It's just for home use. 

I'd be using a Vestax PDX-2000 MKII 

I'm looking to use Gear4Music as they seem reasonable priced and have everything in stock.

Behringer NX1000 Power Amplifier £236

https://www.gear4music.com/PA-DJ-and-Lighting/Behringer-NX1000-Power-Amplifier/2FZN

(This looks neat and also not too big and energy saving)

SubZero C12 Passive Carpet PA Speaker, Pair £219

https://www.gear4music.com/PA-DJ-and-Lighting/SubZero-C12-Passive-Carpet-PA-Speaker-Pair/3YE0 

(I know they cheap but hopefully these will sound alright? Hoping to be able to tweak the sound with the mixer)

SubZero C12SA Active PA Subwoofer £249.99

https://www.gear4music.com/PA-DJ-and-Lighting/SubZero-C12SA-Active-PA-Subwoofer/3P55

(My thinking getting the active sub-woofer would save on the extra amp. Would it work like that? And would it be controlled with the crossover ok?)

Behringer CX2310 V2 Pro Super-X Crossover   £101.50

https://www.gear4music.com/PA-DJ-and-Lighting/Behringer-CX2310-V2-Pro-Super-X-Crossover/2L8L

(Would the active subwoofer work directly from this point? It has a dedicated port.)

Behringer PMP500 Europower Mixer Amplifier £288.50

https://www.gear4music.com/PA-DJ-and-Lighting/Behringer-PMP500-Europower-Mixer-Amplifier/1WMN

(Was recommended this unit. Is it overkill? It says Amplifier? I don't think this means I don't need an amp? (Sorry for the dumb question.) Maybe something smaller and cheaper would do? Any thoughts much appreciated. I guess I could have my home hifi and PC sound also connected through this when I'm not using the PA. Just thinking out loud. It does give me lots of dials to twist and turn.)

SubZero Phono Preamplifier £19.99

https://www.gear4music.com/Recording-and-Computers/SubZero-Phono-Preamplifier/211K

(I'll need one of these for my deck to start the chain?)

If all goes to plan I will want to add a dub siren effects unit which I assume would go through the mixer.

Would the above work? Been buying dub for over 35 years and it be amazing to hear it somewhere near how it should sound. 

I'm already over budget and what ever it cost's, the missus will only hear of half that.. lol..

Any advice would be much appreciated. Thank you for having a look. 

All the best... Mike

Where in the country are you.

I'm in Blandford, I have some 12 inch tapped horns that play well into the 30s, they were prototypes so will need a tidy up and paint, 15mm birch ply, you can have them for £120 each with drivers, you can have a play with them at my workshop before you pay so you know what they can do, get yourself an amp and simple xover and run your hi-fi as mid tops, job done.