I wouldn't worry about buying the newest strut -- an Accu-Strut is an Accu-Strut. Unless it's the XD, which is lighter, but still functions the same. IMO, spend your money on something else.
As for the adjustable gas block, I know some will say you can "tune" it for the load, weather, etc., but IMO gas port bushings are easier to deal with. Shoot the lowest-power load you plan on using regularly, and pick the smallest bushing that will still allow it to function. I've found that a .045" is just about ideal for what I shoot (Remington UMC 55gr., Federal/AE XM193, Hornady Varmint 55-gr.).
The Accu-Strut will still work if you go with the ASI block, you just won't be able to attach it to the block. Butt it up against it tight, and clamp it to your barrel.
At the end of the day, my recommendation is to buy a set of 3 GPBs (say, .050", .045", and .040"), new gas block bolts, and some Blue LocTite. Spend the rest of the couple hundred bucks on ammo. Or mags. Or toward a better optic. Or a Scout Mount. Or... :lol: