Adding exterior insulation, rain screen, and housewrap – GreenBuildingAdvisor

Hi, I’m working up the learning curve of planning out re-siding my Zone 4 PNW home. I’ll be adding house wrap, 2-3″ of exterior insulation, and a 3/4″ rain screen and just trying to nail down a few details:

1) House wrap – Going with self adhering. Can I expect a notable long term benefit from using more primo products vs less expensive ones? In my mind, there’s a hierarchy among the ones I’ve looked at ranging from Siga Majvest 500 at the top to Solitex Adhero 3000 to Blueskin VP100. My contractor also suggested Grip-Rite ProWrap SA. It’s just hard to gauge how accurate that ranking is or how big the gaps are between products. Or even if there’s a product I should consider that I’m not.

2) Exterior insulation

a) I’m planning on doing an inch of polyiso beneath 1-2″ of GPS to balance out the pluses and minuses of each. I assume that’s sound, if not totally necessary. Meaning the walls would dry to the inside.

b) Is using GPS board with a PSI of 10 a recipe for crumbly boards with lower longevity or more damage during insulation, limiting their effectiveness?

c) I am keeping my existing windows. I won’t pretend to be a windows expert, but my sense is that they’ll either need to be re-installed or at least re-flashed and re-trimmed. Sound about right? Are the complications around that an argument for keeping my exterior insulation more like 2″ than 3″ or is that not a big deal?

3) Rain screen – My plan is to have the lumber yard rip 3/4″ plywood into 2″ strips. Happy to hear if that’s the wrong width or material – I know a lot of people use 1×3’s.

4) Tying it all together – So my sense is that the siding nails should go at least 1.5″ into the studs. Meaning I would need nails at least 5.56″ long based on:

0.31″ siding + 0.75″ rain screen + 2.5″ exterior insulation + 0.5″ sheathing + 1.5″ into studs

So too long for a nail gun. And making the furring strip fasteners (probably screws) almost as long. Is that the correct approach? Are there scenarios where I instead nail the siding into only the sheathing or even just the furring strips and can feel comfortable it will be structurally sound for the next 50+ years? And would that impact the question of what material/width for the furring strips?

I already have opinions and a direction I’m leaning on each of these items, but it’s still all relatively new to me so any thoughts would be incredibly helpful. Thanks!