I can completely understand that. By all means, I'm not trying to steer you away from the larger brakes, I was trying to offer an alternative but since you have pretty much been there with a different vehicle than you know what you need better than I!
NorCal is "probably" going to steer you towards what I did with mine, especially if you are going to end up leveling it at any point. I'll spare all that here, I'll send you a PM with what all I did and why. It's pretty much what ANY of them recommend for a leveled GM IFS vehicle due to their factory limitations.