For a daily driven car, a good choice for a moderate drop and excellent ride / handling compromise would be either stock ZHP springs with Koni FSDs or Hotchkis springs and Koni FSDs. At your mileage you will need FCABs, RTABs, and very likely will also need front control arms. Might as well get it all taken care of while you're in there.
'03 330i ZHP - Stock-ish
'02 330Ci - Megasquirted, E85'd and tuned by PFTuning.com