To start with a 4" spring lift is not a bad start. You can add ez inchs to it, that will give another inch, plus move the axle forward a bit. They are not that expensive. The stock shackles are weak so getting some aftermarket shackles are useful which adds a little more, with 4" springs you can easily end up with 6" of lift.
To start with the 4" would not be a bad idea. I do not think the difference between a 6 and a 4 is that noticable to most folks, especially with the tire size you plan on running.
But the 6 can turn in to an 8 with all of the afore mentioned mods.
I have had blazers with 4" of lift and 35s stock on 35s 9" of lift on 38s (and 40s) and 3" of lift on 42s. Most of these were on the same truck. I now have a blazer with a 6" lift on 35s
If flex is important than you will have to trim no matter what, even if you went a full 8" (6' spring+ ez inch+shackle)
A flexible 6" lift is going to be more stable off road than a super stiff 4" lift
To start with the 4" would not be a bad idea. I do not think the difference between a 6 and a 4 is that noticable to most folks, especially with the tire size you plan on running.
But the 6 can turn in to an 8 with all of the afore mentioned mods.
I have had blazers with 4" of lift and 35s stock on 35s 9" of lift on 38s (and 40s) and 3" of lift on 42s. Most of these were on the same truck. I now have a blazer with a 6" lift on 35s
If flex is important than you will have to trim no matter what, even if you went a full 8" (6' spring+ ez inch+shackle)
A flexible 6" lift is going to be more stable off road than a super stiff 4" lift

