I've used both Koni FSD and Sport and recommend the Sport. Looks like your best options for sport springs are Eibach pk or Dinan; I'd stay away from H&R springs. If you go this route, make sure you get shorter bumpstops. Read jwong77's thread.
If you want a nice c/o, KW Street Comforts.
2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, KW/M3 susp, Apex Arc 8, Mich PSS