As mentioned, most of it will be from the shocks.
Start reading about spring rate and spring style (linear vs dual vs progressive) and the effect they have on your ride.
That being said, you want firm enough springs so they don't sag but soft enough springs so the ride isn't rough. Currie and metalcloak are my favorite.
Rubicon express springs are very stiff, to the point where their spring rate is nearly twice that of cheap lift springs. Its what I run and will be changing them out one day. I need more spring travel and they are too firm for my jeep weight.