I think I would aim for a “mix & match” set of 4 Thumps and 2 subs. That way you can either go out with two set of 1 sub and 2 thumps each, or with a large set of 2 subs and 2 thumps and a small set of just two thumps or you can (if you have only one gig) go with 2 subs and 4 thumps. Everything active, no hauling around 2-4 amps.
That way you can just take what you need for the gig your are going to and if you both have something of the same size you both get to take a sub-supported PA with you.
You’ll have to see what happens if you sell everything you have now and how much extra you need to spend to get a setup like I described.
But that is just me. I understand budget plays a big role in these decicions. For me the process always boils down to:
a) what do I need to own (which is a PA that I can use for 75% or more of my gigs), what components do I need to have
b) what quality do I want to bring to a venue
c) can I make some kind of return of investment with gear I buy (I always charge seperately for gear), if you expect it to take 5-6 years before your PA is paid for, I don’t think owning is the best option.
d) if I can’t afford what I want in the end, is it better to go with lesser quality (for me that answer is always no) or should I rent the quality I want to bring until I can afford to buy what I want.
Good luck & greetinx,
C.