OME makes a variety of spring rates. To be fair there isn't a lot of difference between them, but they have different springs for geared up rigs vs bone stock.
I got the HD springs, for heavy rigs, because of my planned mods. But for now my TJ is stock. The ride is rough, unless I put a bunch of extra weight in it. It's still a TJ, but the added weight calms the suspension down a lot. Once I put armor, aftermarket bumpers, winch, and 33s with a full size spare it will be fine.
Shocks are Rancho RS-5000X. Adequate is probably the best way to describe them.
For the OP, yes, on other cars spring rates are very much taken into account depending on what kind of ride you want. For sport cars especially there is a wide range of springs available.