Just to be clear, all your suggested sound systems will be overkill for the intended purposes
Personally I would go for a single Cubo 15 or Cubo 18, combined with 2 good quality 12"/1" tops, a digital sound processor and quality amps (I'm obviously biased in this).
As you're going for separate sub and kick bins a sound processor is going to be very important for the quality of the bass. Set a correct delay on the kicks and tops and use good crossover settings on all cabinets plus a high pass on the subs. Personally I don't think 30 Hz capability (like the X1) is needed for relatively fast psy, imho it sounds better on lower BPM psy and even then it's not really needed, the lack of it might even give the impression of faster bass, although good processor settings will also accomplish this. A 40 Hz high pass (Cubo 15's) or even 50 Hz high pass (1850 horn) will work, although I think 40 Hz is perhaps the best of both worlds.
The 1850's would be my first choice for larger events outside but last choice for smaller events inside. The same goes for horn loaded tops, great for larger parties, not needed for small parties allthough you could do it for looks