You should be fine with 2/4 drop and 20's. Hey a 2/4 is about as low as you want to go for a daily driver. I was like you and didnt think a 2/4 would be low enough, but i had a 3/4 and hated it and raised it back to a 2/4 and its sits perfect after it settled and still rides good.
2002 Red Chevy RCSS (engine mods)- 05 5.3L, Procharger P-1SC 9lb.pulley, 80mm BBK TB, TB By-Pass, 38lb. Inj., AlkyControl Meth Kit, ASM L/T's, Magnaflow X-pipe, Borla's, FLT Level 5 4L65e, PI 3000 Stall, B&M Tranny Cooler, 3:73's, G-80, E-Fans, 160' Thermo. Custom Built Intake with K&N. WideBand 02 Sensor, DIXIE TUNED.