I have BC Coils with fsport sway bars, lowered 1.5 inches (settled) and adjusted the damper - the ride quality is MUCH better than stock in all aspects (comfort, handling).
I personally would not buy springs on OEM shocks... would rather have the flexibility of adjusting the dampers to get the ride quality i want AND be able to revert back to stock suspension if/when i decide to sell the car in the future...
But if you need spring suggestions, I have heard the F-Sport springs provide a very subtle drop, either those or the Tanabe NF210.
If you go from stock > 20's, wouldn't the wheel diameter (w/ tire) be bigger, resulting in the car standing a bit higher than stock? If that's the case, I'd be curious to see how it would look with the settled 1.5 drop! Keep us posted!