My thoughts lean to doing some planning first. The first question is, how many taps do you envision next season? How about in 5 years?
Then build towards your 5 year. I see you are at about 400 taps now on a 2x6. If you only see 500 taps next year any of those RO's will work, if you see 1000+ in 5 years, you want a better RO. 1st the NGMP RO is good but it has limitations on how much water it can remove. However a 180 NGMP next year would do fine on 500 taps but not on 1000 taps. In fact it would surely help even on 600 taps but it would be slower than you really want.
A 2x6 can do a lot of taps but you need an RO that can get the concentrate to a higher sugar %.
I deal with this issue myself. I have a Deer Run 250 RO, it works fine but has it's limitations. It will only take 2% sap to 7.5-8% concentrate in one pass, depending on the sap temperature. I then recirculate from my head tank and regularly get to 10-12% and sometimes even 15% but my RO can not do that high in one pass and while I can remove about 3 gpm permeate in the first pass if the sap is at 37-38 F it will only remove about 2.6 gpm if the sap is at 34 F.
The better RO's will get you there much faster, but for a much bigger investment.
Which ever RO you decide on be planning with the 3-5 yr out in mind. That said, a NGMP for next year and then a bigger one a year or 2 after can be a good plan too, a used RO in good shape can command a good price, sometimes close to what you have in it or for that matter the Micro or the CDL too, any will get good money back when resold if in good condition.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.