I told them what I wanted based off riding in Roy's and L8Apeaks car. I just went even 600. I had my shocks redone w/ the custom piston because I like for the car to sit low at additional cost of course. This way I have the suspension travel I need the same as other w/ their car slightly or more higher. My shock profile is mirrored off of Roys w/ a few changes based on my driving style but that is something Sam will ask you when ordering yours. I can't tell the difference because I haven't compared my car vs his. But I'm heavier too so that'll change some handling I'm sure until I can actually get the car weighed and no longer call her a pig.
Some guys I know are running 750 up front but that's too much IMO for a daily driver. After talking to Sam though it's all in the shock baby...
I may go w/ a higher spring rate in the rear because mine bottomed out the day I broke my torque arm and I was only going 30 mph around a curve doing it. OR my TA was just on it's way out and that was the icing on the cake.
I'll know for sure this spring though at the Ring.