Bilstein 6112 w/'Aftermarket' Springs

I'm running 6112's with the Bilstein (600lb I think) Springs set at the 3rd notch. Got an ARB bumper on the way (+~100lbs).

I am a little puzzled as to which springs to get to compensate for the extra weight.
I know I'll need 2.5" springs to fit the circumference of the bilstein shock body.

What spring rate would you suggest?

 

The Bilstein 650# spring should be enough to keep the same ride height. If you want to get other brands I believe it would just need to be 14" x 3". The inner will be 2.5"

 

If you are V6 you might need #700. With a 4 cylinder with Iron I'm on the stock #600 and that's even with a winch

 

I run the bilstein 6112's with an ARB, no winch and on the 2nd setting. Barely any rake, almost dead level. 3rd notch would put me nose high with stock rear springs. The bilsteins are 600lb coils, stock is 540 i believe. Eibach makes a 620lb spring that'd be perfect.