Newbie DJ help! Crown + JBL MP225 + 255S good?

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Hello there,

I DJ-ed for about 1 year, using very primitive equipment, for small
house parties, and that was about 7 years ago (from 2005).

Now I decided to start again but with a relatively more serious
stuff... I have been looking here and there in the internet in order to
put together a PA system, which would be powerful enough for indoors,
600 people, yet with very high quality sound!! I am a perfectionist and
quality matters very much to me. Also, I am a newbie to this and I need
some professional help.

[Music used for: Hip-Hop, Rock, Techno, Jazz]

I have finally came up with this (investing no more than $4k.)
I am thinking to get:
- Tow Crown CE2000 or Tow Crest Pro 6001 amps (I am not sure which one
to go with)
- A pair of JBL MP225 500w speakers
- A pair of JBL MPro 255S 500w Subs (Crossover needed? I don't know.)

With this configuration I am worried that I will run out of highs. I
was thinking about a pair of JBL SR4732X Three-Way, instead of the
MP225 speakers for more highs, but those speakers will exceed my
budget.

I am in need of some professional advice to make my decision. Please, I
would appreciate any of your experienced/professional advice, opinions.
Also, tell me if there is any other alternative I can go with to
produce the same or higher quality/power to satisfy myself and an
indoor crowd of about 600 people, while not above $4k budget.

Thanks to all

Ameen

PS: I would really like to know where these brands (Behringer,
Turbosound, JBL, Gemini, Cerwin, Mackie, Peavey, Phonic, EAW, Bose)
stand in terms of PA Speakers/Amps/Subs for a mobile DJ use? I mean
which one is the best and which one is the worst for DJs? Which ones
fit and which ones don't for this kind of applications?